The bark of an older redwood tree is fireproof.
65
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
A ball of glass will bounce higher than a ball made of rubber.
73
Iron weighs more after it rusts.
68
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199