Word: chemists
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Dates: during 1990-1999
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...After accidentally swallowing synthetic lsd, Swiss chemist Albert Hofmann discovers the drug's hallucinogenic effects...
...Swiss chemist Paul Muller determines that ddt is a powerful insecticide...
...German chemist Walther Nernst explains why absolute zero (about -273[degrees]C) can never be reached; this becomes the third law of thermodynamics...
...Belgian-American chemist Leo Baekeland patents Bakelite, the world's first true plastic...
...chemist Willard Libby develops radiocarbon dating, which can determine the age of objects made of organic materials, such as wood and bone