![]() After a few zeppelin raids over London, British troops developed incendiary bullets that would "light up the hydrogen in the dirigibles," says David Aubin, a professor for the history of science at Sorbonne Université in Paris. German zeppelins were the strategic weapons of their time, drifting over civilian targets and dropping bombs from their gondolas.īut zeppelins had a critical vulnerability: They were filled with highly flammable hydrogen. ![]() "It's the one element out of the entire periodic table that escapes the Earth and goes out into outer space," Hayes says.Īmerica once thought helium would turn the tide of war.ĭuring World War I, aviation was still in its infancy, and dirigibles were considered cutting-edge weapons of war. But only helium physically disappears from the planet. ![]() ![]() Other resources, such as oil and gas, may turn into pollution or be difficult to recycle. ![]()
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