Balsa wood is classified as a hard wood!
41
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The bark of an older redwood tree is fireproof.
65
Aluminum used to be more valuable than gold!
84
A cubic yard of air weighs about 2 pounds at sea level.
31
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101