1) J.K. Rowling's "Harry Potter" series of books has sold over 500 million copies worldwide and has been translated into 80 languages.

2) The Pacific Ocean is the largest ocean on Earth, covering more than 30% of the planet's surface.

3) The Earth's core is hotter than the surface of the Sun.

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