Usually not long, mostly you just have to get their attention first. (:
It takes one week to make jelly-beans! A whole week!
So it could take a year or a couple of mounths or week depending how long you take on it.
4,500 years
2 seconds
forever
Usually not long, mostly you just have to get their attention first. (:
4 years
about half a year
It took the first computer 1 hour and 36 minutes to make computations.
how long does it take to make a crayons
Galileo created his first telescope in around two months in 1609. It was a refracting telescope with a convex objective lens and a concave eyepiece. This instrument revolutionized astronomy and allowed Galileo to make groundbreaking astronomical observations.
They have been around since 1903.
2 1/2 years
It took about 48 hours, from start to finish product
Yes, as long as it isn't a dare. Make the other guy do it first.
the first flushing toilets were made in Elizabethan England