BLAZARS: The Most Powerful Objects in the Universe.
https://youtu.be/dxZfouUpReM
Invention of Bicycle.
A bicycle is a vehicle with two wheels mounted one behind the other on a metal frame. The rider propels the bicycle by pushing two pedals with feet around a circle. In 1885, an English gentleman named J. K. Starley , produced the first commercially popular bicycle with both wheels of equal size. In 1890, brakes and air filled rubber tyres and handle came to be added. The bicycle today, is the cheapest mode of transportation across the world. It is also used in various sports activities.
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