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Updated: June 2016 There are any number of serious reasons your hair can suddenly start to fall out - illness, thyroid disease, nutrient deficiency, extreme physical stress or many other diseases or medications. These are important to consider. Hair loss is a signal of something wrong. I'm skipping the more serious problems and going right to the things you put on your hair! Let's talk about friction. You need friction to stop on roller skates, on a bicycle, in a car. Smooth ice = low friction and you just keep going when you try to stop. Rough pavement = plenty of friction to slow your motion and your tires wear down over time. Friction is an issue for anybody with more than a half inch of hair because there is a lot more to hair care than moisture or protein or whatever the bottle or shampoo or conditioner says a product is for. Some people have healthy hair that doesn't need a lot of extra help staying hydrated, but it does need extra lubrication. The longer your hair is...

Hair has a lot of enemies. That's why it keeps growing. Sunlight, chemical treatments, packing tape that your brother sticks in your hair because he thinks it's a great joke - all hard on your hair. Certain grazing animals have teeth which grow throughout their lives because the grasses they eat contain a lot of silica, which grinds down teeth and the initial parts would soon be worn out. ©Science-y Hair Blog 2013 People have hair which keeps growing to keep our heads covered, even if our hair should be broken or pulled out. You only need see a bald person who was outside with no hat or sunscreen to understand the severity of the sunburn you can get on your scalp. Sunburn leads to water loss from skin, unhealthy skin, potential for infection. Not to mention an overheated scalp can make an overheated person and hair may help us modulate the temperature of our heads. Where we keep our brains. Our constantly-growing hair is always growing and replacing itself because nature expect...