How much do you know? Check out what is true and what is false below (click the question mark to find out!) as Mr Dorsey, the best teacher in this universe, challenges you - what do you know?

Every person has about 5 million hairs all over his or his body
We each lose 500 hairs a day off our head
The world record for the longest hair is 13ft 2 inches (4.2 m)
Blondes have more hair than brunettes or redheads
The hair on your head grows about 1 foot a year
Combing your hair is less detrimental than brushing
Female hair grows faster than male hair
A hair can have a lifespan of up to 7 years
Hair grows faster in cold weather
Many drugs can cause hair loss.