1. The Earth is the third planet from the Sun and is the only known planet to support life.
2. The universe is estimated to be 13.8 billion years old, while the age of the Earth is approximately 4.54 billion years.
3. The tallest mountain in the world is Mount Everest, which stands at 29,029 feet (8,848 meters) above sea level.
4. The Great Barrier Reef, located off the coast of Australia, is the largest coral reef system in the world and is home to thousands of marine species.
5. The human brain contains about 100 billion neurons, or nerve cells, and is the control center for all body functions.
6. The Sahara Desert in Africa is the largest hot desert in the world and covers an area of about 3.6 million square miles (9.4 million square kilometers).
7. The Nile River, which flows through Egypt, is the longest river in the world, stretching for approximately 4,135 miles (6,650 kilometers).
8. The United States Declaration of Independence was adopted on July 4, 1776, and is considered one of the most important documents in American history.
9. The Mona Lisa, painted by Leonardo da Vinci in the 16th century, is one of the most famous and iconic paintings in the world.
10. The periodic table of elements, which organizes all known chemical elements by atomic number and electron configurations, was first published by Dmitri Mendeleev in 1869.
11. The speed of light is approximately 299,792,458 meters per second, and is considered to be the fastest possible speed in the universe.
12. The smallest particle in the universe is the quark, which is a fundamental constituent of matter.
13. The largest planet in the solar system is Jupiter, which is more than twice the size of all the other planets combined.
14. The first successful powered flight of an airplane was achieved by the Wright brothers on December 17, 1903, in Kitty Hawk, North Carolina.
15. The world's largest mammal is the blue whale, which can grow up to 100 feet (30 meters) in length and weigh as much as 200 tons.
16. The world's first artificial satellite, Sputnik 1, was launched by the Soviet Union on October 4, 1957.
17. The largest volcano in the solar system is Olympus Mons, located on the planet Mars, which is about three times taller than Mount Everest.
18. The Statue of Liberty, a symbol of freedom and democracy, was a gift from France to the United States and was dedicated on October 28, 1886.
19. The human heart beats approximately 100,000 times a day and pumps about 2,000 gallons (7,500 liters) of blood through the body.
20. The highest waterfall in the world is Angel Falls, located in Venezuela, which drops 3,212 feet (979 meters) from the top of a table-top mountain.
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