Uses of Hydrogen bombs and other such bombs
Tsar Bomba is the nickname for the AN602 hydrogen bomb, the most powerful nuclear weapon ever detonated in human history. Developed by the Soviet Union, the bomb was originally designed to have a yield of about 100 megatons of TNT, but the yield was reduced to 50 megatons in order to reduce nuclear fallout (and also to prevent the blast from destroying the drop aircraft). Only one bomb of this type was ever built and it was tested on October 30, 1961, in the Novaya Zemlya archipelago.
"The first atomic bomb, exploded in the desert of New Mexico, created such intense heat that it fused the desert sand to glass." (July 16, 1945) The device exploded with an energy equivalent around 20 kilotons of TNT. It left a crater of radioactive glass in the desert 10 feet deep and 1,100 feet wide. The shock wave was felt over 100 miles away, and the mushroom cloud reached 7.5 miles in height. Wikipedia
Man with Ladder: Nuclear Shadows in Hiroshima, Japan. Since thermal radiation generally travels in straight lines from the fireball any opaque object will produce a protective shadow. The aftermath of the attack found shadows of people but not their bodies (which were instantly vaporized by the heat of the explosion.)