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What am I?

I'm lighter than air but a million men can't lift me. What am I?

Correct answers: 131

The first user who solved this task is Fazil Hashim.

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Radioactive synthesis

In 1936, the first radioactive substance to be produced in the U.S. synthetically was radium E, by bombarding the element bismuth with neutrons. This was achieved by Dr. John Jacob Livingood at the University of California at Berkeley.

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