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US tested first thermonuclear weapon with help from Gerwin and Teller on Eniwetok in the Pacific. This new weapon was 1,000 times more powerful than the convential nuclear device which is why hydrogen bomb research and development over-shadowed atomic nuclear weapons.
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Created in London on July 9, 1955 by Bertrand Russell in the midst of the Cold War. It highlighted the dangers posed by nuclear weapons and called for world leaders to seek peaceful resolutions to international conflict. Einstien signed it too, days before his death.
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Soviet Union dropped hydrogen bomb from airplane in Siberia where is was very remote. Much less powerful than one dropped at Bikini but made Americans nervous.
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The United Stes dropped the improved hydrogen bomb from a plane over the tiny island of Namu in the Bikini Atoll in the Pacific Ocean. The successful test indicated that hydrogen bombs were viable airborne weapons.
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The test was carried out at high altitude over the largely uninhabited Christmas Island to minimise nuclear fall-out.