A hummingbird weighs less than a penny.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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Fidgeting can burn about 350 calories a day.
201
Dieters who sleep more take off more fat that those who sleep less.
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The cat brain weighs about 30g.
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The average person's skin weighs twice as much as their brain.
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The Main Library at Indiana University sinks over an inch every year because when it was built, engineers failed to take into account the weight of all the books that would occupy the building.
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A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
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