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A 0.0000000000001 kiloton (milligram-ish) explosion has a comically large blast radius.

It says "Fireball radius: 0 m" for me. Did you click the 'Detonate' button? It's not one of those things that updates as you type.

Yeah, all the radius read 0 m, but the map overlay of the blast still covers several miles.

It just draws a very small circle for me. The only part that seems suspect is the casualties estimate:

> Estimated fatalities: 6,010

> Estimated injuries: 8,060

> In any given 24-hour period, there are on average 28,743 people in the light (1 psi) blast range of the simulated detonation.

vs. a Davy Crockett in the same location:

> Estimated fatalities: 4,130

> Estimated injuries: 2,790

> In any given 24-hour period, there are on average 12,248 people in the light (1 psi) blast range of the simulated detonation.