Physicist Day
Physicist Day is held on May 7. Since 1959. This event in the first decade of the month May is annual. 
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Thales was the first physicist. He believed the world was only built from one element: water. Aristotle developed Aristotelian physics in 300 B.C., but most of it was speculative and proven wrong by other philosophers. Archimedes' encounter with buoyancy in 250 BC is the first fundamental physics discovery. Physics delivers the facts, facts that are logical and can be explained with pure mathematical logic, unbiased and without being agitated by our personal prejudice.
People usually run so that they can lose excess mass and be fit but wait what physics has to say. According to a concept of variation of mass with speed, the more you speed, the more mass you gain. It is mathematically and experimentally proven fact.
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