If the chemical sodium is dropped into water it will immediately and violently explode.
67
The smell of freshly cut grass is actually a plant distress call.
31
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
The bark of an older redwood tree is fireproof.
65
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5