Saturday, December 18, 2010

How many times do you have to cut a piece of A4 before it's the width of an atom?

Q. How many times would you have to cut the long side of a piece of A4 paper in half before it's the width of an atom?


This question appears on overhead advertising boards on the DART (Dublin local commuter train). There’s a mobile number so you can text the Institute of Physics in Ireland to check if your answer is right.

Answer: 31

Click for other teasers, such as what happens if you try to light a candle in an orbiting space station.