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  2. Time dilation - Wikipedia

    en.wikipedia.org/wiki/Time_dilation

    Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them (special relativity), or a difference in gravitational potential between their locations (general relativity). When unspecified, "time dilation" usually refers to the effect due to velocity.

  3. Human hair growth - Wikipedia

    en.wikipedia.org/wiki/Human_hair_growth

    It is commonly stated that hair grows about 1 cm per month on average; however reality is more complex, since not all hair grows at once. Scalp hair was reported to grow between 0.6 cm and 3.36 cm per month. The growth rate of scalp hair somewhat depends on age (hair tends to grow more slowly with age), sex, and ethnicity. [3]

  4. Stem cell theory of aging - Wikipedia

    en.wikipedia.org/wiki/Stem_cell_theory_of_aging

    A key aspect of hair loss with age is the aging of the hair follicle. [15] Ordinarily, hair follicle renewal is maintained by the stem cells associated with each follicle. Aging of the hair follicle appears to be primed by a sustained cellular response to the DNA damage that accumulates in renewing stem cells during aging. [16]

  5. Here's why astronauts age slower than the rest of us here on ...

    www.aol.com/heres-why-astronauts-age-slower...

    But time is weird, and there's another phenomenon called relative velocity time dilation that usurps gravity's effect. Why astronauts age slower Relative velocity time dilation is where time moves ...

  6. Ageing - Wikipedia

    en.wikipedia.org/wiki/Ageing

    Around age 55, hair turns grey. [31] Pattern hair loss by the age of 55 affects about 30–50% of males [32] and a quarter of females. [33] Menopause typically occurs between 44 and 58 years of age. [34] In the 60–64 age cohort, the incidence of osteoarthritis rises to 53%. Only 20%, however, report disabling osteoarthritis at this age. [35]

  7. Millions Of People Take Biotin For Hair Growth, And Many Are ...

    www.aol.com/millions-people-biotin-hair-growth...

    $20.80 at humnutrition.com. While biotin and biotin supplements may seem like the most promising route for addressing hair loss and growth, it's not the best solution for everyone.

  8. 5 ways your grandparents might be affecting your health - AOL

    www.aol.com/lifestyle/grandparents-affect-hair...

    Her advice: Do your best to avoid harsh hair grooming practices and consult a dermatologist early on if you notice hair thinning. “With hair loss , time is of the essence,” Rodney says.

  9. DNA damage theory of aging - Wikipedia

    en.wikipedia.org/wiki/DNA_damage_theory_of_aging

    A key aspect of hair loss with age is the aging of the hair follicle. [47] Ordinarily, hair follicle renewal is maintained by the stem cells associated with each follicle. Aging of the hair follicle appears to be due to the DNA damage that accumulates in renewing stem cells during aging. [48]

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