Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Out of all the senses, smell is most closely linked to memory.
146
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
Scientists aren't sure what color dinosaurs were.
312
Iron weighs more after it rusts.
68