Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
A cesium atom in an atomic clock beats over nine billion times a second.
43
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117