map (function, iterable, ...) Â¶ Apply function to every item of iterable and return a list of the results. If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel.
The grey hair ârule of thumbâ is that by the age of 50, half of the population have lost the colour in 50% of their hair. When researchers tested this rule, they found that 74% of people aged between 45 and 65 had grey hair, with an average intensity of 27%.Generally, men have more grey hair than women.he grey hair ârule of thumbâ is that by the age of 50, half of the population have lost the colour in 50% of their hair. When researchers tested this rule, they found that 74% of people aged between 45 and 65 had grey hair, with an average intensity of 27%. Generally, men have more grey hair than women.
Just what qualifies as premature greyness differs greatly. Your first grey hair will most likely appear on average at age 34, and by the time you are 50, around half of all Caucasians are likely to have a head of grey hair.ust what qualifies as premature greyness differs greatly. Your first grey hair will most likely appear on average at age 34, and by the time you are 50, around half of all Caucasians are likely to have a head of grey hair.