--- title: Hair: growing, curly and straight, eyebrows, eyelashes and going grey — a lesson of Mova's school · trees and pragmatics description: «Hair: growing, curly and straight, eyebrows, eyelashes and going grey», a lesson of the biology course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Each hair grows from a tiny pocket in the skin called a follicle; only the root down in the follicle --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Biology](https://md.mova.elamur.ai/free/en/corpora/school/biology/) / Hair: growing, curly and straight, eye… # Hair: growing, curly and straight, eyebrows, eyelashes and going grey Lesson 355 of the biology course of Mova's primary school: 16 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/0/) — Each hair grows from a tiny pocket in the skin called a follicle; only the root down in the follicle is alive, and the strand you see is dead keratin, the same stuff as your nails. - [1](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/1/) — That is why a haircut does not hurt but having your hair pulled does: the scissors cut dead strands, while pulling tugs on a living root full of nerves. - [2](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/2/) — The shape of the follicle decides the shape of the hair: a round one grows straight hair, a flat or oval one grows curly hair, the way a round or a flat nozzle shapes icing. - [3](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/3/) — Hair colour comes from melanin made in the root; when the colour cells slow down and stop, new hairs grow in white, and a head of white and dark hairs mixed looks grey. - [4](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/4/) — A head has about 100,000 hairs; blondes often have more and redheads fewer, and losing about 50 to 100 hairs a day is normal. - [5](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/5/) — Hair grows about one centimetre a month; each hair grows for years, then rests and falls out, and a new one grows from the same follicle. - [6](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/6/) — The longest hair recorded was over five metres, grown by a woman in China. - [7](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/7/) — The hair you see is dead keratin, the same material as nails; only the root under the skin is alive, and shaving does not make hair grow back thicker. - [8](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/8/) — Round follicles grow straight hair and flat or oval follicles grow curly hair, and hair shape is inherited from your family. - [9](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/9/) — Eyebrows guide sweat and rain away from the eyes and help show feelings such as surprise or anger; each has a few hundred hairs. - [11](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/11/) — Tiny harmless mites live in the roots of the eyelashes of most adults. - [12](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/12/) — Hair colour comes from two kinds of melanin, a brown-black one and a red-yellow one, mixed in different amounts; natural red hair is the rarest, about one or two people in a hundred worldwide; strong summer sun breaks down some of the melanin in hair already grown, so hair often looks lighter in summer. - [13](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/13/) — Grey hair grows when colour cells in the roots stop making melanin, and many people start to go grey in their thirties or forties. - [14](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/14/) — The story of hair turning white overnight from a fright is doubted by scientists, because the hair already grown is dead and cannot change colour from inside. - [15](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/15/) — Fine hair covers almost all the body except the palms, the soles and the lips, and helps you feel touch, like an insect landing; babies before birth are covered in fine hair that is lost before or soon after birth. - [16](https://md.mova.elamur.ai/free/en/corpora/school/biology/355-hair-growing-curly-and-straight-eyebrows-eyelashes-and-going-grey/16/) — Rubbing a balloon on dry hair moves tiny electric charges, and each hair pushes away from the others; this is static, and it works best in dry winter air. - ← previous: [Skin: fingerprints, scabs, scars, bruises and blisters](https://md.mova.elamur.ai/free/en/corpora/school/biology/354-skin-fingerprints-scabs-scars-bruises-and-blisters/) - next →: [Nails, sweat and smells: smelly feet, armpits and bad breath](https://md.mova.elamur.ai/free/en/corpora/school/biology/356-nails-sweat-and-smells-smelly-feet-armpits-and-bad-breath/) - ↑ back to [Biology](https://md.mova.elamur.ai/free/en/corpora/school/biology/)