How quickly does human hair grow?

You’ll be amazed to learn how fast human hair grows. Read on for the juicy facts.

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Rear view of girl combing hair

Human hair grows on average 1.25 centimetres (0.5 inches) per month, which is equivalent to about 15 centimetres (six inches) per year. There are several variables that can affect hair’s growth rate such as age, health and genetics. Each hair grows in three stages, the first being the anagen phase where most growth occurs. The longer your hair remains in this stage dictates how long and quickly it develops; this can last between two and eight years and is followed by the catagen (transitional) and telogen (resting) phases. Hair growth rates vary across different areas of the head, with that on the crown growing the fastest.

Answered by Laura Mead, Science Museum.

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  • fabien

    Saturn is not the only planet to have rings. Jupiter, Uranus and Neptune (in the form of an arc) have ring.
    The solar system is evolving, the rings won’t stay around Saturn forever.

  • Robert Stepp

    Some corrections. The rings are mostly made of water ice. The main rings are about 30 feet thick. When viewed edge on, some vertical formations have been seen to pile up in bumps up to 2 miles tall. The rings are being replenished and shepherded by various moons. There is no geyser emanating from Saturn’s south pole or anywhere else on Saturn. This information is taken off of the NASA web site. http://solarsystem.nasa.gov/planets/profile.cfm?Object=Saturn&Display=Overview