Japanese engineers were asked to redesign the front end of the Bullet Train because it carried enough speed to create a sonic boom whenever it exited a tunnel. Residents could feel the blast from miles away.
11
Play-Doh was first manufactured as a wallpaper cleaner.
122
Each king in a deck of playing cards represents a great king from history: spades - King David, clubs - Alexander the Great, hearts - Charlemagne, and diamonds - Julius Caesar.
33
Music is as addictive to the brain as sex and drugs.
27
Yawns are more contagious among people with closer relationships.
163
Only about 2% of the world population has green eyes.
36
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9