1. A woman's hippocampus —central to memories, mood, and emotions—grows in sync with estrogen levels as she goes through her menstrual cycle.
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  2. In 1993, a company attempted to launch a giant billboard into low earth orbit. From earth, the billboard would look almost as big as a full moon. After the project was canceled, a bill was introduced that banned any further space advertising.
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  3. Hearing is the fastest human sense. A person can recognize a sound in as little as 0.05 seconds.
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  4. In 1999, Coca Cola invented a vending machine that could adjust its prices based on the temperature, allowing it to hike up the price of a Coke on a hot summer day.
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  5. Eating an early dinner, or just skipping it altogether, may increase the amount of fat a person burns at night, a study found.
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  6. On November 9th, 2016, the most searched "How Did..." question on Google was "How did Trump win?"
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  7. There are 189 things named after George Washington: 1 state, 7 mountains, 8 streams, 10 lakes, 33 counties, 9 colleges, and 121 towns and villages.
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  8. The city of Oatman, Arizona, hosts a Solar Egg Frying Contest every 4th of July.
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  9. Armadillo is a Spanish word meaning “little armored one.”
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  10. When spun on a table, a U.S. ‘Lincoln Memorial' one-cent coin will land on tails 80% of the time.
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  11. At 10,582sq km in size and about 100km across, Salar de Uyuni in Bolivia – the world's largest salt flat – is roughly the size of Jamaica.
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  12. Just 0.21% of the U.S. total population live in its capital city, the lowest percentage in the world.
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  13. You can get tetanus a not just from a rusty nail but also from a perfectly clean one. It is caused by bacteria commonly found in soil, dust and animal feces.
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  14. In 2014, a man from Arizona stole a diamond worth US$160,000 and traded it for US$20 of weed.
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  15. The Axeman of New Orleans, a murderer who terrorized the city in 1918 and 1919, spared any home that was playing jazz, his favorite music.
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  16. A honeybee has the same amount of hairs as a squirrel: 3 million.
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  17. Fruit flies use hairs on their head and thorax to catapult dust off of them at accelerations of up to 500 times Earth's gravity.
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  18. The names of the English rivers Avon, Axe, Esk, Exe and Ouse all mean ‘river' or ‘water' in various ancient languages.
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  19. The McHotDog is a hot dog available at McDonald's in Japan.
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  20. The female panda may only be fertile for a few days each year but during this period she will mate dozens of times with multiple males.
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  21. The Star Wars lightsaber sound was made by combining the hum of an idle film projector and the buzz from an old TV set.
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  22. Six-pack abs indicate nothing about your strength, your flexibility, your stamina, your speed, or your overall level of health.
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  23. A bottlenose dolphin may use its tail flukes to flip a fish out of the water, and then retrieve the stunned prey.
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  24. Amsterdam alone has 350 outdoor festivals every year.
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  25. A zoo in Japan once spent four years trying to mate a pair of hyenas before realizing they were both males.
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  26. One prevailing theory as to why butt hair exists is that there's simply
    no significant evolutionary pressure against butt hair.
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  27. The only father-daughter collaboration to hit number one on the Billboard pop chart was “Something Stupid” by Frank and Nancy Sinatra in 1967.
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  28. A species of stingray from the Amazon River is the only non-mammal to be observed chewing their food.
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  29. Ping-pong balls have been made larger to make the sport better for television.
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  30. People love Pandas because it reminds them of babies, some scientists say.
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