1) The total length of your blood vessels can circle the Earth more than twice.

2) The first commercially successful video game was "Pong," released in 1972 by Atari.

3) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

4) The Treaty of Tordesillas, signed in 1494, divided the newly discovered lands outside of Europe between Spain and Portugal, leading to the colonization of the Americas.