Balsa wood is classified as a hard wood!
41
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
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 in Germany have developed a candy that doesn't cause cavities.
11
Pure water (H2O) does not conduct electricity on its own.
46
Pumice is the only rock that floats on water.
14