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I am weightless, but you can s...

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Correct answers: 70

The first user who solved this task is Jasmina Atarac.

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Lloyd Viel Berkner

Born 1 Feb 1905; died 4 Jun 1967 at age 62.American physicist and engineer who first measured the extent, including height and density, of the ionosphere (ionized layers of the Earth's atmosphere), leading to a complete understanding of radio wave propagation and he helped develop radar systems, especially the Distant Early Warning system. He later investigated the origin and development of the Earth's atmosphere. Early in his career, he worked on radio navigation beacons for the Airways division of the Bureau of Lighthouses (1927-28), as radio engineer on the Byrd Antarctic expedition (1928-30). Returning to the U.S. Bureau of Standards (1930-33) he studied the ionosphere using radio-pulse transmissions, then terrestrial magnetism with the Carnegie Institution (1933-51).

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