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 Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Research indicates that plants grow healthier when they are stroked.
173
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5