Megaton

Before the atomic bomb, most bombs were based on explosives similar to TNT. Therefore the explosive power of atomic bombs is compared to the equivalent weight in TNT. A one ton explosive force is equivalent to 2,000 pounds of TNT. One megaton is equivalent to 1 million tons or 2 billion pounds of TNT.

Using Einstein's relationship between matter and energy, one megaton of energy would be released if about 50 grams of matter was completely converted into energy.

1866
Alfred Nobel invents dynamite, a safer explosive that combines nitroglycerine with an inert filler.

1905
The first Nobel Peace Prize was awarded, nine years after Nobel's death.