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 Invention of Zero [Vote Average: 3, Total Votes: 354 Hits: 1398]
Invention of zero has had a tremendous impact on history of mankind because it made development of higher mathematics possible...
Updated On: 10/11/2007
Tags:
Who invented Zero, History of mankind, Invented in India, Higher mathematics, Development of higher mathematics, Hindu-Arabic system, Modern science, Multiplied by Zero
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 Invention of Paper [Vote Average: 3, Total Votes: 479 Hits: 1353]
Without paper there would be no books, no magazines, no newspapers, no notebooks...
Updated On: 10/11/2007
Tags:
Stone walls, kingdoms of Pergamum, Egyptian papyrus, Greeks and Romans, Muslim Spain, Prehistoric men drew and painted on the stone walls, Clay tablets, Papyrus, Waxed tablets, Parchment, Most convenient methods of communication, Eumenes, Monarch of Pergamum, Mysterious realm of China, Tsai Lun, Smooth thin sheets of paper
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 X-Ray [Vote Average: 3, Total Votes: 435 Hits: 1083]
In 1895 Roentgen discovered the rays which are called after him and which he nicknamed "X-rays" because he did not what they were or where they came from...
Updated On: 10/11/2007
Tags:
Discovery of X-rays, Motion Picture companies, Major Scientific Achievements, Wilhelm Conrad Roentgen, Nobel Prize for Physics, X-rays tube, X-ray machines
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 Jet Engine [Vote Average: 3, Total Votes: 372 Hits: 1259]
The jet engine works by ejecting a stream of gas at high velocity and high pressure, to produce a thrust...
Updated On: 10/11/2007
Tags:
produce a thrust, various stages of development, Frenchman Lenoir, Frank Whittle, Marcus designed, practical proposition
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 Litmus Paper [Vote Average: 3, Total Votes: 315 Hits: 2774]
Litmus paper is used in laboratories to detect the presence of acids and bases...
Updated On: 10/11/2007
Tags:
produce a thrust, various stages of development, Frenchman Lenoir, Frank Whittle, Marcus designed, practical proposition
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 Machine Gun [Vote Average: 3, Total Votes: 346 Hits: 882]
In 1865 the French officer Reffye invented a machine gun with a total of 25 fixed barrels, which fired 125 to 150 missiles a minute...
Updated On: 10/11/2007
Tags:
officer Reffye, invented machine, machine gun, quicker firing models, Marcus designed, practical proposition
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 Why Does Newspaper Tear Smoothly Vertically and Raggedly Horizontally? [Vote Average: 3, Total Votes: 212 Hits: 785]
In 1865 the French officer Reffye invented a machine gun with a total of 25 fixed barrels, which fired 125 to 150 missiles a minute...
Updated On: 10/11/2007
Tags:
Sheet vertically, Invented machine, Machine gun, Quicker firing models, Marcus designed, Horizontal position
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 Why Do Cars Now Have Side-View Mirrors on the Passenger Side with the Message, "Objects in the Mirror Are Closer Than They Appear"? [Vote Average: 3, Total Votes: 103 Hits: 747]
Convex mirrors have one huge advantage over flat mirrors - they allow a much wider angle of vision...
Updated On: 10/11/2007
Tags:
reasonable person, Invented machine, Machine gun, Quicker firing models, Marcus designed, automobile industry
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 Petroleum [Vote Average: 3, Total Votes: 377 Hits: 1239]
We have no idea how long ago men first found petroleum or mineral oil...
Updated On: 10/11/2007
Tags:
how long ago, found petroleum, Baku in Armenia, Turkish fleet, oil extracting, unpleasant smell
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 Plastic [Vote Average: 3, Total Votes: 372 Hits: 909]
There can be no doubt that this is an age of plastics...
Updated On: 10/11/2007
Tags:
modern technology, synthetic materials, resin Bakelite, Electric plugs, modern plastics, moulding process
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