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Five things you didn’t know about your body

Head Squeeze comes with the facts: being left-handed is a hereditary thing, fevers are a good thing because they kill off the viruses that are comfortable at 37.5 degrees Celsius, the brain is massive because the cortex is 3500 centimeters squared, laughing keeps you fit and the eyebrows help you see.

The last bit was a bit strange. It seems that the eyebrows stop the sweat from our foreheads from entering our eyes. Nice trick, evolution.

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