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

2) The process of photosynthesis, performed by plants, algae, and some bacteria, is responsible for producing the oxygen we breathe.

3) The book series "The Chronicles of Narnia" by C.S. Lewis has sold over 100 million copies worldwide.

4) The first successful portable MP3 player, the Diamond Rio PMP300, was released in 1998 and could hold up to 60 minutes of music.