421In which year did Alexander Graham Bell patent the telephone?
422Which scientist duo is credited with discovering radium and polonium?
423Who are credited with discovering the double-helix structure of DNA?
424In which year did Isaac Newton publish his Principia Mathematica describing the law of gravity?
425Who is credited with significantly improving the compound microscope for biological study?
426Who is credited with inventing the mercury thermometer and its temperature scale?
427Who invented the mercury barometer for measuring atmospheric pressure?
428Who developed the process of pasteurization to kill harmful microbes in liquids?
429Who developed the first vaccine against rabies?
430Who invented the electric generator, or dynamo, based on electromagnetic induction?
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