Optical illusions occur when what the eyes see conflicts with what the brain expects.
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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.
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Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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The idea of left brain (logical) and right brain (creative) has no basis in neuroscience and is in fact a myth.
16
One third of the electricity produced on earth is used to power electric light bulbs!
75
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
4.5 pounds of sunlight strike the Earth each day.
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