1. Green olives and black olives are not different species. The distinction reflects whether they were picked before or after ripening.
  2. In six hours, the world's deserts receive more energy from the sun than humans consume in a year.
  3. YouTube is the second largest search engine, right after Google. It's bigger than Bing, Yahoo!, and Ask combined.
  4. 37%
    of adults in Africa are illiterate.
  5. While most penguins are monogamous, they spend most of their year apart.
  6. Tigers were declared extinct in Cambodia in 2016.
  7. Venezuela had the world's highest inflation rate in 2015 with over 141%.
  8. Cockroaches have a much higher radiation resistance than vertebrates, with the lethal dose perhaps 6 to 15 times that for humans.
  9. Cocaine has a small number of accepted medical uses such as numbing and decreasing bleeding during nasal surgery.
  10. Towards the end of his life, Christopher Columbus produced a "Book of Prophecies," in which his career as an explorer is interpreted in the light of Christian eschatology and of apocalypticism.
  11. Uranus' axis of rotation is tilted sideways, so its north and south poles lie where most other planets have their equators.
  12. The chlorine in swimming pools isn't what causes red eyes. It is the chlorine binding to the bacteria in the water.
  13. Winds howl across Venus at super-fast speeds that can reach 450 mph (724 kph) in its middle cloud layer.
  14. White tigers are prone to having crossed eyes (strabismus).
  15. Zippers became popular during the Great Depression, because buttons were considered too costly.
  16. As recently as 2012, new stretches of the Great Wall of China have been discovered around the border of present day Mongolia.
  17. The stones at Machu Picchu fit so tightly together that not even a knife's blade could fit between them.
  18. Spotted hyenas sometimes scavenge, but, contrary to popular belief, they kill 95% of their food.
  19. About 90% of the world's earthquakes occur along the Ring of Fire, an area in the basin of the Pacific Ocean.
  20. It is estimated that 25–30% of suicides are accompanied by a note.
  21. The largest free rock concert ever had 4.2 million people. It was held by Rod Stewart in Rio de Janeiro, Brazil.
  22. The First YouTube Video was uploaded on April 23, 2005, featuring its co-founder Jawed Karim at the San Diego Zoo.
  23. While most of the Amazon rainforest is in Brazil (60%), it's also in Peru (13%), Colombia (10%), Venezuela, Ecuador, Bolivia and three countries.
  24. The "Territorio De Zaguates" (Land of the Strays) in Costa Rica is a huge no-kill dog shelter where you can hike for free with the dogs.
  25. Of the 8 species of bears, the polar bear is mostly carnivorous, the giant panda feeds almost entirely on bamboo and the remaining six species are omnivorous with varied diets.
  26. There is a secret swimming pool in the Mojave Desert that anyone who finds it can use.
  27. Facebook co-founder Eduardo Saverin renounced his U.S. citizenship to avoid paying US$700 million in taxes.
  28. 7% to 10% of Arabs are Christians.
  29. The four highest mountains on Earth, Everest, K2, Kanchenjunga and Lhotse, were first scaled in 1953, 54, 55, and 56.
  30. The demand for currency was so low during the Great Depression, the U.S. mint halted the production of nickels between 1932-33.
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