401Who is credited with inventing the telephone?
402Who is credited with developing the first commercially practical electric light bulb?
403Who invented the printing press with movable type in Europe?
404Who is widely credited with the invention of the first mechanical television system?
405Who is credited with inventing radio communication?
406Who invented the electric telegraph and Morse code?
407Who are credited with building and flying the first successful powered airplane?
408Who is credited with significantly improving the steam engine, driving the Industrial Revolution?
409Alfred Nobel, founder of the Nobel Prizes, is best known for inventing which explosive?
410Who is credited with the discovery of penicillin?
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