What Igor Sikorsky invented?
Answer: C
Igor Sikorsky invented the helicopter.
The Russian-born American engineer flew the VS-300 in 1939, the first practical single-rotor helicopter with a tail rotor to counter torque - the configuration almost every helicopter has used since.
Please log in or register to report this question.
What beverage was invented by Charles Alderton in 1885 in Waco, Texas?
Answer: C
It was Dr Pepper.
Charles Alderton, a pharmacist at Morrison's Old Corner Drug Store in Waco, Texas, mixed it in 1885 - a year before Coca-Cola, making it the oldest major soft drink in the United States.
Please log in or register to report this question.
What inspired reflecting road lights to be invented?
Answer: B
It was the light a cat's eyes gave off on a fence.
Percy Shaw, driving on a foggy road in Yorkshire in 1933, saw his headlamps reflected in a cat's eyes and was saved from going off the road. He patented the reflecting road stud - still called cat's eyes - the next year.
Please log in or register to report this question.
What Karl Benz invented?
Answer: A
Karl Benz invented the petrol-powered automobile.
His Patent-Motorwagen of 1885, a three-wheeler with a single-cylinder four-stroke engine, was patented in January 1886 and is reckoned the first true motor car. His wife Bertha made the first long road journey in it in 1888.
Please log in or register to report this question.
Who was the first American female to patent her invention, a method of weaving straw with silk?
Answer: D
Mary Kies was the first.
She received a United States patent in 1809 for a method of weaving straw with silk or thread, used in making bonnets. Napoleon's embargo had cut off European straw hats, so the technique found a ready market.
Please log in or register to report this question.
What did cardiologist Dr. Paul Zoll invent in Massachusetts in 1952?
Answer: D
He invented the pacemaker.
Paul Zoll demonstrated in 1952 that a stopped heart could be restarted and kept beating by electrical impulses delivered through the chest wall. The implantable pacemaker followed at the end of that decade.
Please log in or register to report this question.
World's first mechanical air conditioner was invented and manufacture by
Answer: D
Willis Carrier invented it.
His machine of 1902 was designed to control humidity at a Brooklyn printing works, where damp paper was spoiling colour registration; cooling the air to condense moisture was the means. Comfort cooling came later.
Please log in or register to report this question.
Radioactivity was discovered by
Answer: A
Henri Becquerel discovered radioactivity.
In 1896 he found that uranium salts fogged a photographic plate wrapped in black paper, without any exposure to light, so the radiation came from the element itself. He shared the 1903 Nobel Prize with the Curies.
Please log in or register to report this question.
Who is often called the 'first African-American' inventor?
Answer: C
It is Benjamin Banneker.
A free African-American of Maryland, he built a striking wooden clock in 1753 from his own calculations, compiled almanacs with astronomical tables, and helped survey the boundaries of the District of Columbia.
Please log in or register to report this question.
Who invented the mercury thermometer?
Answer: C
Daniel Fahrenheit invented it.
He made the first mercury thermometer in 1714, mercury being better than alcohol because it expands evenly and does not boil until 357 °C. He devised his scale with the same instrument.
Please log in or register to report this question.
