When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Liquid TIDE laundry detergent glows under a blacklight.
96
Iron weighs more after it rusts.
16
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Sound travels fifteen times faster through steel than through air.
134