All mammals have hair (or fur). It is one of the things that makes mammals mammals. Therefore humans have hair. And hair is a big deal for a lot of people. Between shampoos and conditioners, hair cutting, hair appliances and hair treatments, humans spend billions of dollars on their hair.

Why Each Person Has a Maximum Length for Hair
Why Does Hair Grow The Way It Does?
How Does Hair Know When to Stop Growing?
Why Does Your Hair Turn Gray? – Speaking of Chemistry


Why Do People Go Bald?
The Science of Hair Loss/Balding

Hair Transplants

How Do Hair Transplants Work? | Earth Lab
Hair Transplants Don’t ‘Cure’ Baldness — But Here’s What Can Help Slow It

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