Donald Trump's repeated talk of annexing Canada is almost universally treated as a joke in Washington. Or, maybe, as a ...

The blast would have incinerated everything within 1.91 square miles. On October 23, 1961, the Soviets conducted nuclear test #123 over Novaya Zemlya. Test #123 used a 12.5 megaton nuclear bomb.

And all this came from a 1.4 megaton bomb. Tsar Bomba ... So, there would be no mushroom-shaped cloud and no subsequent blast wave or mass destruction. Instead, you'd get a blinding fireball ...