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Jesus Christ was born in the year 0 as he is the person we have based our dates from, as Christianity is the most popular religion.
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Gunpowder was a Revolution in Mans Ability to kill from the dInvention of gun powder. Invented in 800 AD.
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Thomas Edison was one of the first known and well publicized inventors of electricity; it was in the form of a light bulb, invented in 1879.
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A world war is a war affecting the majority of the world's most powerful and populated nations. So far there have been two World Wars, WW1 from 1914-1918 and WW2 1939-1945.
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The 1st man on the moon was the Apollo 11 Commander Neil Armstrong, who made history on July 20, 1969.
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The wheel was invented 8000 bc in Asia. The wheel is one of of our most used items in the modern world and has been so for 1000's of years.
http://library.thinkquest.org/C004203/science/science02.htm
