Destruction of Pompeii - AJ

• The destruction of Pompeii was caused by the big eruption of mount Vesuvius 79 AD and was tragic.  
• In Pompeii the people had not known that mount Vesuvius was ever a volcano and it also didn't erupt in approximately 1800 years! The estimated amount of the population that had died from the initial blast, but about 15,000 to 20,000 people had died flow of lava. The actual initial blast didn't cause as much damage as the flow of the lava that had spread through most of the city.
• Pompeii was so well preserved because of all the volcano ash that buried it very well and it could now be used for the Roman city  snapshots of their history. 
• Once the city was buried with Volcano ash it was very difficult to discover, but in 1748 the workers of King Charles the third had stumbled upon. At the height of 1,281 meters and at  the estimated age 17,000 years old and it has erupted over 50 times.
• Mount Vesuvius erupted six times in the 18th century, eight times in the 19th century  and in 1906, 1929 and 1944. There has been no eruption since 1944!!!
  
  
  
  
  

How car engines work? - Navo

• A car engine can look like a big confusing jumble of metal, tubes and wires to the uninitiated. You might want to know what's going on simply out of curiosity. Or perhaps you are buying a new car, and you hear things like "3.0 liter V-6" and "dual overhead cams" and "tuned port fuel injection." What does all ­of that mean?
• The ­principle behind any reciprocating internal combustion engine: If you put a tiny amount of high-energy fuel (like gasoline) in a small, enclosed space and ignite it, an incredible amount of energy is released in the form of expanding gas. You can use that energy to propel a potato 500 feet. In this case, the energy is translated into potato motion. You can also use it for more interesting purposes. For example, if you can create a cycle that allows you to set off explosions like this hundreds of times per minute, and if you can harness that energy in a useful way, what you have is the core of a car engine! The core of the engine is the cylinder, with the piston moving up and down inside the cylinder. 

• The spark plug supplies the spark that ignites the air/fuel mixture so that combustion can occur. The spark must happen at just the right moment for things to work properly. The intake and exhaust valves open at the proper time to let in air and fuel and to let out exhaust. Note that both valves are closed during compression and combustion so that the combustion chamber is sealed. A piston is a cylindrical piece of metal that moves up and down inside the cylinder.
• Piston rings provide a sliding seal between the outer edge of the piston and the inner edge of the cylinder. The rings serve two purposes:

- They prevent the fuel/air mixture and exhaust in the combustion chamber from leaking into the sump during compression and combustion.

-They keep oil in the sump from leaking into the combustion area, where it would be burned and lost.

What are Drones and how do they work? - Navo

• In the military, they are UAVs (Unmanned Aerial Vehicles) or RPAS (Remotely Piloted Aerial Systems). They are most commonly known as drones.
• The Drones are used in situations where manned flight is considered too risky or difficult. They always provide troops with a 24-hour "eye in the sky", seven days a week. The aircrafts can stay aloft for up to 17 hours at a time, loitering over an area and sending back real-time imagery of activities on the ground.
• The Drones are used by the United States Air Force and Royal Air Force range from small intelligence, surveillance and reconnaissance craft, some light enough to be launched by hand, to medium-sized armed drones and large spy planes.
• The Two of the medium-sized drones currently in use in Afghanistan and Pakistan are the MQ-1B Predator and the MQ-9 Reaper. These Odd-looking planes carry a wealth of sensors in their bulbous noses: color and black-and-white TV cameras, image intensifiers, radar, infra-red imaging for low-light conditions and lasers for targeting. They can be armed with laser-guided missiles.
• However, drones are unmanned, they are not unpiloted - trained crew at base steer the craft, analyse the images which the cameras send back and act on what they see.Each multi-million dollar Predator or Reaper system comprises four aircraft, a ground control station and a satellite link.
• MQ-1B Predator (formerly called the RQ-1 Predator) was originally designed as an aircraft for intelligence-gathering, surveillance, identifying targets and reconnaissance. Although, since 2002 it has been equipped with two Hellfire II missiles, meaning it can strike at a range of up to 8km (five miles). The newer MQ-9 Reaper was conceived as a "hunter-killer" system. It carries four Hellfire missiles and laser-guided bombs such as Paveway II and GBU-12. 

How Cable Television Works - Navo

• During the early 1950s, cable systems began experimenting with ways to use microwave transmitting and receiving towers to capture the signals from distant stations. During some cases, this made television available to people who lived outside the range of standard broadcasts. In other cases, especially in the northeastern United States, it meant that cable customers might have access to several broadcast stations of the same network. Finally, the first time, cable was used to enrich television viewing, not just make ordinary viewing possible. This also started a trend that would begin to flower fully in the 1970s.
• In both tuning systems, each television station was given a 6-megahertz (MHz) slice of the radio spectrum. The FCC had originally devoted parts of the very high frequency (VHF) spectrum to 12 television channels. 
• The channels weren't put into a single block of frequencies, but were instead broken into two groups to avoid interfering with existing radio services.
• Radio signals travel through the air at a speed very close to the speed of light. In a coaxial cable like the one that brings CATV signals to your house, radio signals travel at about two-thirds the speed of light. When the broadcast and cable signals get to the television tuner a fraction of a second apart, you see a double image called "ghosting."
• As the number of program options grew, the bandwidth of cable systems also increased. Early systems operated at 200 MHz, allowing 33 channels. As technology progressed, the bandwidth increased to 300, 400, 500 and now 550 MHz, with the number of channels increasing to 91. Two additional advances in technology -- fiber optics and analog-to-digital conversion -- improved features and broadcast quality while continuing to increase the number of channels available.

How Batteries Work - Navo

• Visualize a world where everything that used electricity had to be plugged in. Electronics like Flashlights, hearing aids, cell phones and other portable devices would be tethered to electrical outlets, rendering them awkward and cumbersome. All Cars couldn't be started with the simple turn of a key, a strenuous cranking would be required to get the pistons moving. 
• Many Wires would be strung everywhere, creating a safety hazard and an unsightly mess. Finally, batteries provide us with a mobile source of power that makes many modern conveniences possible.
• When there are many different types of batteries, the basic concept by which they function remains the same. While a device is connected to a battery, a reaction occurs that produces electrical energy. This is also known as an electrochemical reaction. This Italian physicist Count Alessandro Volta first discovered this process in 1799 when he created a simple battery from metal plates and brine-soaked cardboard or paper.
• Then, scientists have greatly improved upon Volta's original design to create batteries made from a variety of materials that come in a multitude of sizes.
•  1938, archaeologist Wilhelm Konig discovered some peculiar clay pots while digging at Khujut Rabu, just outside of present-day Baghdad, Iraq. These jars, which measure approximately 5 inches (12.7 centimeters) long, contained an iron rod encased in copper and dated from about 200 B.C. 
• The Tests suggested that the vessels had once been filled with an acidic substance like vinegar or wine, leading Konig to believe that these vessels were ancient batteries. After this discovery, scholars have produced replicas of the pots that are in fact capable of producing an electric charge. The "Baghdad batteries" may have been used for religious rituals, medicinal purposes, or even electroplating.

How the Radio Spectrum works - Navo

• You've probably heard about "AM radio" and "FM radio," "VHF" and "UHF" television, "citizens band radio," "short wave radio" and so on. Have you ever wondered what all of those different names really mean? What's the difference between them?
• A radio wave is an electromagnetic wavepropagated by an antenna. Radio waves have different frequencies, and by tuning a radio receiver to a specific frequency you can pick up a specific signal.
• When you listen to a radio station and the announcer says, "You are listening to 91.5 FM WRKX The Rock!," what the announcer means is that you are listening to a radio station broadcasting an FM radio signal at a frequency of 91.5 megahertz, with FCC-assigned call letters of WRKX. Megahertz means "millions of cycles per second," so "91.5 megahertz" means that the transmitter at the radio station is oscillating at a frequency of 91,500,000 cycles per second. Your FM (frequency modulated) radio can tune in to that specific frequency and give you clear reception of that station. All FM radio stations transmit in a band of frequencies between 88 megahertz and 108 megahertz. This band of the radio spectrum is used for no other purpose but FM radio broadcasts.
• In the same way, AM radio is confined to a band from 535 kilohertz to 1,700 kilohertz (kilo meaning "thousands," so 535,000 to 1,700,000 cycles per second). So an AM (amplitude modulated) radio station that says, "This is AM 680 WPTF" means that the radio station is broadcasting an AM radio signal at 680 kilohertz and its FCC-assigned call letters are WPTF.

How HDMI works - Navo

• If you've shopped for an HDTV, a PlayStation 3, or an HD-DVD or Blu-ray pla­yer, you've probably heard about HDMI. It can seem like just one of many connections on televisions or home-theater receivers. But HDMI is more than a port on the back of a TV (and the often expensive cable that fits inside). It's a set of rules for allowing high-definition electronic devices to communicate. ­­
• Before the development of high-definition televisions, most TVs displayed pictures in what is now known as standard definition.The picture was roughly square -- its aspect ratio was 4:3. Its resolution, or the number of dots that make up the picture on the screen, was about 704 x 480 pixels.
•  The picture was interlaced -- each piece of the moving image was really half a picture, but the pictures changed quickly enough that the human brain didn't really notice. Finally, older TVs relied on analog signals, which travel as a constantly varying electrical current.
• Created by a group of electronics manufacturers, the HDMI standard is a set of guidelines for creating high-bandwidth connections between digital devices. With the right setup, HDMI can make a significant difference in a home-theater system. The current standard can carry 1080p high-definition signals, and it supports eight channels of uncompressed audio, enough for a 7.1 surround-sound system. 

   HDMI Founders

1. Hitachi
2. Matsushita Electric (Panasonic)
3. Royal Philips Electronics
4. Silicon Image
5. Sony Corporation
6. Thomson and Toshiba Corporation

Solar Energy - Navo

• Solar energy is a type of renewable energy which means we can use it again and again.
• Solar energy is light and energy that is absorbed by the sun due to our amazing technology. This type of energy has been used for over thousands of years in many types of ways. Some of the ways are Cooking, Heating and etc.
• In many situations it makes electricity when power sources are not working. Many houses have Solar panels and it is making it cheaper for electric bills. The biggest competitors to make energy is coal and oil.
• Solar Energy helps to reduce the salt in water. Solar Power plants change the sun's light into electricity using Photovoltaices. Photovoltaics are cells that containing solar material that converts energy from the sun to direct current electricity   
• On the equator the sun provides about 1000 watts of solar energy per square meter on the Earth's surface.

Mayan Civilization - AJ

• The Maya lived in the Yucatan since 2,600 B.C. To day this part is Southern Mexico, Guatemala. By 250 A.D., the Mayan civilization was now at it's peak of power. The Maya had their own writing system and had three different calendars. They also had their  language too.
• The early astronomers created there own collection or data of what thought many  constellations were called and what they looked liked. They also studied the phases of the moon with a spoon, a door , and a mirror. 
• The Maya first started counting time when astronomers used a spoon, a door, and a mirror to find sunset and sunrise. They started making their own way of writing to calculate how long a day was. The number system was not used after a long period.
• The Maya also created many temples that were made of gold and stone. Then, the Mayan civilization started to rise slowly and they had also created avast empire that was almost impossible to destroy. Maya started to defeat many kingdoms and ruled for a long time.
• At one point different parts of Maya wanted more and more power so they declared war on each other. This caused the great down fall of the Mayan civilization and many lives were killed, many home and creations were destroyed. The Mayan civilization was mostly put to it's end.

Central Processing Unit (CPU) - Navo

• The central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions. This phrase has been used in the computer industry at since the early 1960s
• The phrase "CPU" refers to a processor, more specifically to its processing unit and control unit (CU), distinguishing these core elements of a computer from external components such as main memory and I/O circuitry.
• The types of design and implementation of CPUs have changed over the course of their history, but their fundamental operation remains almost unchanged. Many of the Principal components of a CPU include the arithmetic logic unit (ALU) that performs arithmetic and logic operations,processor registers that supply operands to the ALU. Then it stores the results of ALU operations, and a control unit that fetches instructions from memory and "executes" them by directing the coordinated operations of the ALU, registers and other components.
• Many of the modern CPUs are microprocessors, meaning they are contained on a single integrated circuit (IC) chip. The IC, that contains a CPU may also contain memory, peripheral interfaces, and other components of a computer; such integrated devices are variously called microcontrollers or systems on a chip (SoC). A little amount of computers employ a multi-core processor, which is a single chip containing two or more CPUs called "cores"; in that context, single chips are sometimes referred to as "sockets". 
• The Array processors or vector processors have multiple processors that operate in parallel, with no unit considered central.

Enigma - Anita

• The Enigma machine is a piece of hardware invented by a German and used by British code breakers to decipher signals and messages of attack between the Germans during World War II.
• Arthur Scherbius, a German engineer, developed the Enigma, a machine capable of decoding coded messages and transcribing them. He hoped that his invention would interest commercial companies. In 1923 he set up his company, Cipher Machines Corporation, in Berlin to began to manufacture his product. In three years, the German navy was producing their own prototype, along with the air force and army later on.
• Enigma allowed an operator to input a specific message, them would scramble the characters and words by using three to five different notches, or rotors, which displayed different letters to confuse the receiver. The receiver needed to know the exact settings of this machine in order to reconstruct the message. Over the years, the functions of the machine became more complicated and complex as German expert coders began to add plugs with electronic circuits.
• The Germans were convinced that their Enigma code was unbreakable, so they used the machine to send important messages related to the battlefield, navy, and diplomatic communications. The Germans also enjoyed some code breaking success, such as in 1935, when they broke the British Naval code, which enabled them to locate Allied convoys during the war. That same year, the US altered their code too late to prevent the damage German U-boat campaigns caused off America's coast. The Germans also were successful in managing cracking Soviet and Dutch Codes. This information obscured from high-level German sources was named ULTRA.
• The first to come close to breaking the German's Enigmatic code were the Polish, because their engineering industries were closely linked and similar. Since war brewing, the Polish Cipher Bureau decided to share their findings with the British. The British then decided to establish the Government Code and Cipher School at Bletchley Park, Buckinghamshire. Mathematicians and intelligence experts were recruited to began the difficult and urgent task of cracking the Enigma code. Their success began when they were able to read and understand German code in 1940. But their work only began to have meaning when they were able to reconstruct German codes and gather evidence about an invasion on Greece, along with Italian naval plans gained by the German. In March 1941, the German Naval code was finally deciphered and could be read. The British went on to accomplish much more on breaking German codes, but Bletchley Park and its staff made a crucial and groundbreaking contribution in defeating the Axis.

Mobile Computing - Navo

• Mobile computing is human–computer interaction by which a computer is expected to be transported during normal usage, which allows for transmission of data, voice and video. 
• Mobile computing involves mobile communication, mobile hardware, and mobile software. Communication issues include networks and infrastructure networks as well as communication properties, protocols, data formats and concrete technologies. 
• Hardware includes mobile devices or device components. Mobile software deals with the characteristics and requirements of mobile applications.
• Here are some of the most common mobile computing device mobile phones, laptops, Smartphones, Robots, Tablets, Smart cards, wearable computers, and a carputer.
• A carputer is installed in an automobile. It operates as a wireless computer, sound system, GPS, and DVD player. It also contains word processing software and is bluetooth compatible.

The Evolution of Cancer Treatment and Research - Anita

• As you may know, cancer consists of various specific diseases, but is ultimately a condition occurring when an abnormal type of cell develops in a part of the human body, eradicating all other essential human cells. Some of the most common types of cancer are breast cancer, lung cancer, bladder cancer, Melanoma, and so forth. Every year, 7.6 million people die worldwide because of cancer, and nearly 100,000 of these people are children under the age of 15! Statistics have proven that an average of 250 children die everyday, worldwide, due to this disease! Even though technology has advanced enough, effect treatment is desperately needed in order to bring these people back to their normal lives. There are a few treatments which have been proven to have an effect on the demolish of cancer. 
• Radiation therapy is a type of therapy which uses high doses of radiation (special beamed lights) in order to destroy cancer cells and shrink tumors. This therapy helps lessen pain caused by tumors, such as trouble breathing or bladder control problems. This treatment may take weeks to cure a cancer patient. The side effect of this treatment is constant fatigue. The downside of this treatment is that the therapy can accidentally cause more damage to the damaged human cells rather than repairing them. 
• Targeted therapy is a type of therapy that uses precision medicine to target the changes in cancer cell growth and how they spread. As doctors view the changes of cancer cells, they are able to create more precise medications to destroy the cancer cells quicker. In order to have targeted therapy performed, a patient's body must be tested by doctors to see if a type of targeted therapy drug had been created to treat the patient's cancer, in a biopsy procedure. Some side effects of this therapy are constant diarrhea and liver problems. The only drawback of this medication is that the cancer cells sometimes grow resistant towards the drug, making it no longer effective. 
• Chemotherapy is an operation occurring when a liquid drug is injected into a cancer patient's body in order to kill cancer cells. Chemotherapy is extremely popular, and can be used along with other treatments. This treatment can shrink tumors before operations, destroy remaining cancer cells after operation, and help other treatments work more effectively. Similar to Targeted therapy, Chemotherapy can come in many forms, including capsules, injections, or lotions. The downside of this treatment can range from simple hair loss, to bone morrow and red blood cell destruction, and to the expensive price.
• Stem cells are primarily located in the umbilical cord, which is a flexible cord like structure which connects a fetus to the body of any mammalian mother. This cord transports nutrients and vitamins from the mother's reserves and into the fetus, to help continue its development. Since Stem cells are found here, they are packed with healthy benefits. Stem cells have been used in cancer research. Unlike other cells, Stem cells have been proven to rapidly kill cancer cells before they have time to reproduce, along with the ability to assist other cells and body parts to mend themselves naturally. They have also been used in Chemotherapy research. Chemotherapy operation could end up killing the cancer patient's bone marrow and red blood cells. Well, doctors have began using Stem cells to help rebuild these body parts, and repair Radiation therapy side effects. But the Stem cells must be donated from someone, and they must specifically be fetus type cells. Plus, the donor's Stem cell type must match the cancer patient's type. But you can't find fetus Stem cells in another PERSON. So doctors have began preserving umbilical cord after births, and match the various Stem cell types to cancer patients. The only backfire on Stem cell operations is if the Stem cell type from the donor does NOT match the cancer patient's type, the results aren't good. After the donor's Stem cells are injected into the cancer patient's body, they can end up working against the cancer patient and instead help the cancer cells destroy the human cells.
• Technology billionaire Sean Parker has donated $250 million in Immunotherapy cancer research. Immunotherapy is a new type of treatment used for cancer patients. It is a liquid drug invented to harness the immune system, and strengthen the body's immune defenses. Immunotherapy helps slow or stop cancer cells from reproducing. Cancer cells reproduce and kill the human body's cells faster than the human body's cells reproduce. The only problem with this type of treatment is the lengthy period of time needed to allow the immune defenses of the drug and body battle with the cancer cells. This one flaw prevents awareness to be spread about Immunotherapy.
• My theory is to have the Immunotherapy drug work alongside Stem cells. This theory actually eliminates some possible side effects. My theory is to traditionally inject the Immunotherapy drug into the cancer patient's body to strengthen the immune defenses. During this process, Stem cells can SLOWLY be injected into the cancer patient's body, which decreases the risk of of having accidentally used the wrong Stem cell type. While the immune defenses are battling the cancer cells, the Stem cells can rebuild the damaged human cells at a rapid rate. Some Stem cells can also assist the immune defenses. With the human cells reproducing at this rate, the cancer cells will be outnumbered, and eventually destroyed. 

Grafting - Anita

• Grafting is an advanced technique that botanists, farmers, and gardeners use to add living tissue from one plant or tree to another. Grafting is similar to organ donation, because different parts of a plant are changed, just like the organs of a human body. New blood cells begin to develop, and the organ learns how to work with the rest of the body. 
• Plants have the ability to rebuild their vascular tissue, which is what makes grafting even possible. Vascular tissue are the tubes which transport food and water throughout a plant's body. When two plant branches are joined in the process of grafting, their vascular tissues join, and create a new tissue, which is now alive and growing. Now the newly attached plant will grow as part of the original plant. This is also an alternative to help plants reproduce. The process of joining two vascular tissues is called Inosculation. Inosculation is possible because of the following simple plant biology. 
• Found just beneath the outer layer of a plant's stem is a layer of tissue called the Cambium. This layer is undifferentiated, which means it does not have a specific job until it is relied upon by the plant for a new vascular tissue, new roots, or new branches. Grafting takes advantage of the Cambium by directing it, or telling it what to do. 
• Why is grafting so popular? Well, this technique has numerous benefits. A grower can choose any number of plants whose attributes he desires the most. Another type of grafting is rootstock and scion selection. If a grower desires a plant whose roots are strong but fruit aren't delicious or popular, he may use this plant a rootstock, or a plant selected for its roots. This plant can be combined with another plant, whose roots aren't strong, but fruit are desirable. This type of plant may be called the scion, or a plant chosen because of its stem, flowers, or fruit. An amazing scion can be grafted onto a strong rootstock to produce a truly wonderful tree. This is a common practice because it allows for plants to grow in many different areas, and gives us access to more products. 
• Link: How do you graft plants? https://www.youtube.com/watch?v=f1MRBLn4TgQ

Ancient Architecture - Anita

• Ancient Egyptians are primarily known for their architecture creation of pyramids. There are over eighty pyramids in Egypt, all older than 3,000 years. Pyramids are three-dimensional triangular shapes, and are proven to be he strongest types of structures. In Ancient Egypt, they were used as burial grounds for pharaohs, or Egyptian rulers. Riches were buried with the king, so many thieves attempted to rob the pyramids. Architects designing the pyramids were skilled mathematicians, technical drawings, and knowledgeable in he position of the stars and constellations. Their goals were to carefully design the pyramids to align with specific constellations and sunrises. 
• Ancient Greeks were primarily known for their "post and lintel" style of architecture, because it has been extremely influential on the current styles of architecture. The "post and lintel" system is based off of a combination of roofs supported by columns. The column styles vary from Doric, Ionic, and Corinthian designs. Greek architects created precise rules on how to make a building, such as how large it should be, where columns should be located, and how many columns were needed to support the structure. 
• Similar to Ancient Egyptians, Mayans are also know for the styles of pyramids they built, but they have also been known to erect some of the most ancient palaces and other public buildings. There were two types of pyramids, but they were both similar, in the aspect that they both honored God, and consisted of numerous steps. The first type of pyramid is used by priests to climb and make sacrifices to the gods from a designated temple, where the most religious ceremonies were held.. The second type of pyramid was built as a sacred palace to honor a god. Just like Egyptian pyramids, Mayans also built secret doors, tunnels, and traps.
• Unlike all other races, Ancient Chinese followed exactly three styles of architecture: Imperial  Architecture, Commoner's Architecture, and Religious Architecture. There are distinct features used to identify Imperial Architecture for Chinese Emperors, such as yellow tiled roofs and dragons, both royal symbols. The less fortunate would use the Commoner's Architecture, with a shrine to honor deities and ancestors which would also be used during festivals. Other featured rooms were bedrooms, living rooms, dining rooms, and kitchens. Along with that came farm land. Lastly, the Religious Architecture consisted of Imperial Architecture designs, just with Buddhist features included. There was a front hall consisting of a statue of Buddha, along with a great hall filled with Buddha relics.
• In ancient India, every town would have a walled fortress, along with official buildings, gathering places, and an area dedicated to building homes, which was arranged into blocks. Some houses had one room, whereas others had multiple ones, sometimes even having staircases. There were no grand castles or palaces, so rulers sometimes lived within the towns. These houses also surprisingly had plumbing, with running water from wells. Later on, the architecture became more religious, with more Buddhist, Hindu and temple like designs. Each temple had four sections, and an alter, one for gatherings, one for festivals, and one for offerings. There were 50 shrines built to honor these gods. But the most interesting architecture of this time were the cave-buildings, which were amazing temples and houses carved into the mountains. Lastly, Indian Architecture was inspired by the Islamic, which resulted in the Taj Mahal.

Harry Potter - Navo

• Author J.K, Rowling wrote "The Final Chapter" of the last Harry Potter book in 1990, 7 years before the first book released. Harry Potter book have been translated into more than 70 languages.
• The Harry Potter brand has been estimated for more than $15 billion USD. Micheal Jackson wanted to make a Harry Potter musical, but J.K. Rowling said no.
• Harry Potter and J.K. Rowling share the same birthday. President Barack Obama has read every Harry Potter book. 
• There are 106 people named Harry Potter in U.S. according to the Census. 
• For the release of "Harry Potter and The Goblet of fire" over 9,000 Fedex trucks were used for no other purpose than to deliver the books.

Auschwitz - Navo

• Auschwitz, also known as Auschwitz-Birkenau, opened in 1940 and was the largest of the Nazi concentration and death camps. Located in southern Poland, Auschwitz initially served as a detention center for political prisoners. 
• However, it evolved into a network of camps where Jewish people and other perceived enemies of the Nazi state were exterminated, often in gas chambers, or used as slave labor.
• Some prisoners were also subjected to barbaric medical experiments led by Josef Mengele (1911-79). During World War II (1939-45), more than 1 million people, by some accounts, lost their lives at Auschwitz. 
• In January 1945, with the Soviet army approaching, Nazi officials ordered the camp abandoned and sent an estimated 60,000 prisoners on a forced march to other locations. 
• When the Soviets entered Auschwitz, they found thousands of emaciated detainees and piles of corpses left behind.

Tigers - Navo

• A Tiger's roar is pretty loud, so imagine a tiger's roar can be heard as far as 1.8 miles away. That's about 3 kilometers.
• There are more tigers privately owned by a U.S. citizen that the amount of tigers out in the wild. One tiger alone in 19th century killed more than 430 people in Nepal and India.
• The tiger's stripes are not only found in their fur but it is also found on their skin. Cats share about 96% of the DNA with tigers. 
• White Tigers are prone to having crossed eyes. Tigers were declared extinct in Camboida in 2016.
• The Bengal tiger is the national animal of India.