When Will Halley’s Comet next Appear?
When Will Halley’s Comet next Appear? Halley’s Comet appeared in 1910, then in 1986 and will next...
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Which Poisonous Gas Has a Sweet Smell?
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Would You Prefer an Electric Vehicle?
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When Was the First Television Broadcast?
When Was the First Television Broadcast? The first public television demonstration or broadcast was given by...
When Does a Firestorm Occur?
When Does a Firestorm Occur? A firestorm occurs when flames from a large number of individual fires merge...
Who Built the First Rideable Bicycle?
Who Built the First Rideable Bicycle? There are several early but unverified claims for the invention of the...
Why Is DDT Dangerous?
Why Is DDT Dangerous? After extensive use as a pesticide, DDT was found to have many harmful after-effects...
Who Were the American Inventors, Who Chose to Celebrate Their Life’s Work in Death?
Who Were the American Inventors, Who Chose to Celebrate Their Life’s Work in Death? Fredric John Baur: A...
Who Invented the Parachute?
Who Invented the Parachute? Leonardo da Vinci (1452-1519) was thought until recently to have been the first...
Who Designed the First Steamboat?
Who Designed the First Steamboat? The first boat ever to be moved by steam power was designed by a Frenchman...
Where Does the Woodchuck Get Its Name From?
Where Does the Woodchuck Get Its Name From? The woodchuck — whose scientific name is Marmota monax — is more...
Who Invented the Zip?
Who Invented the Zip? Whitcomb L. Judson, an American mechanical engineer, from Chicago invented,...