You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
Play-Doh was first manufactured as a wallpaper cleaner.
122
Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it’s possible that these pitch-black lonely planets support life.
14
Standard paper cannot be folded in half more than 7 times.
232
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Moths are unable to fly during an earthquake.
328