You can tape a small mirror onto a cone speaker, play music and shine a laser on to the mirror and the reflection will look like a laser light show on your wall.
102
The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
244
About two hundred babies are born worldwide every minute.
237
The WD in WD-40 stands for Water Displacer.
30
Play-Doh was first manufactured as a wallpaper cleaner.
122
Caffeine boosts memory.
405


