Diamonds can be shattered with a hammer.
-104
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Balsa wood is classified as a hard wood!
41
Sound at the right vibration can bore holes through a solid object.
134
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 brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5