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The hair on your head has a lifespan between 2 to 7 years. At the end of it's life, the hair strand will fall out and another will start growing in it's place.

Science

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If the hair on your body was longer and thicker like animal fur, having goosebumps would fluff up your fur coat and make your hairs stand up. It would also provide more insulation to keep you warmer.

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The fur of sea otters can have more than 650,000 strands of hair per square inch. It helps to keep them insulated while swimming in cold waters.

Animals

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