1) The word "banana" contains three vowels: A, A, and A.

2) The largest living structure on Earth is the Great Barrier Reef, spanning over 2,300 kilometers (1,400 miles) along the coast of Australia.

3) The game of basketball was invented by Dr. James Naismith in 1891 and has since grown into a global sport played at both amateur and professional levels.

4) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.