Just thought some of you would find this interesting.
The tsar bomb was created during the cold war (1950s) by the Soviets. The purpose, to scare the Americans and show that Russia has just as much power and technology as the United States.
The bomb was originally designed to be 100 Megatons but was later redesigned to 57 megatons. This bomb is equal to 6.84 Trillion individual pieces of tnt going off at the same time.
Here is a chart to show you how big it is compared to anything else man has made:
And of course a video of the detonation:
http://www.youtube.com/watch?v=LxD44HO8dNQ