The earth is approx. 6,588,000,000,000,000,000 tons.
175
A hummingbird weighs less than a penny.
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Sex burns about 360 calories per hour.
860
The average person's skin weighs twice as much as their brain.
131
You burn more calories sleeping than you do watching television.
348
The cat brain weighs about 30g.
167
Most elephants weigh less than a blue whale's tongue.
442
The adult human brain weighs about 3 pounds (1,300-1,400 g).
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