15 July 1961
Dear Mrs. Kennedy:
Your children, like all other children in the world, are laying down in their bones, along with the calcium, Strontium 90.
This substance is present in the world because of the explosion of nuclear bombs. If more bombs are tested, the amount of
strontium 90 will increase, and your children, accordingly, will have a greater change of being injured by this radioactive
material in their bones.
I urge you to use your influence to safeguard your children as well as all of the children of the world by keeping the United
States Government from resuming nuclear testing under any circumstances.
The Geneva negotiations must continue until agreement is reached.
Ava Helen Pauling