The nuclear explosions in Hiroshima and Nagasaki were around 20 kilotons. Each kiloton is about 4.184× 10 to the power 12 joules, or 4.184 Tera Joules - that is about 80 Tera Joules. So, at 24:56, when they give the same number, they have done their home work well. Yet, that was first, almost trial, nuclear bombs, nowadays, much higher power is being used.

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