For the world's generals and statesmen, the radioactive "fallout" from nuclear explosions is a grave worry for the future. For scientists who date ancient objects by Carbon 14. it is already a serious nuisance and threatens to get worse. Southwestern laboratories near the Nevada atom-bomb testing ground have found it impossible to use Carbon 14; there is too much competing radioactivity in their vicinity. Even on the Eastern seaboard, Carbon 14 work at the University of Pennsylvania has often been stopped by a radioactive cloud drifting slowly overhead. The "background radiation" gets so...
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