Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Sound travels about 4 times faster in water than in air.
408
The earth is approx. 6,588,000,000,000,000,000 tons.
175
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
One ragweed plant can release as many as one billion grains of pollen!
51