When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
21
A cesium atom in an atomic clock beats over nine billion times a second.
43
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Aluminum used to be more valuable than gold!
84
A ball of glass will bounce higher than a ball made of rubber.
73
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6