Pumice is the only rock that floats on water.
14
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
There is a surgical implant being developed that will give you an orgasm at the touch of a button.
20
The bark of an older redwood tree is fireproof.
65