Medicine: Strong & Weak Bombs

The fourth atom bomb blast at Frenchman's Flat, Nev. was the biggest of the series. It lit up the sky brightly at San Diego, 300 miles away. At Los Angeles, 250 miles away, the light was strong enough before dawn to take a dramatic picture (see below). Earth tremors shook Las Vegas (about 70 miles away), where the air blast broke a plate-glass window in Marjer's department store.

A much more distant effect of the explosions was a radioactive snowfall in the northeastern U.S. University of Rochester scientists boiled snow water and found the residue radioactive. In other cities, scientists got similar...

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