27 hours.
mankind's don't need time to double the size. becauze they are very fast in doubling the population.
about 254 years
For as long as man has existed.
Arthritis has been around for as long as mankind has been.
55209 days 123 hours 12 mintues 5 seconds
err long double
Two years from now.
Long before mankind existed.
as long as a double decker bus
five hours
Short term, mankind. Long term, the evolution of the Sun.
Yes but still long way to go to popularise