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May 15


Saturday 15, 2004:

The largest prime number to be discovered, 2<sup>24036583</sup>&nbsp;&minus;&nbsp;1, is found by Josh Findley and the GIMPS collaborative effort.


Wednesday 15, 1957:

Britain tests its first hydrogen bomb in Operation Grapple.


Thursday 15, 1941:

Baseball player Joe DiMaggio starts his record-breaking 56-game hitting streak.


Wednesday 15, 1918:

The US Post Office Department (later renamed the USPS) begins the first regular airmail service in the world (between New York City, Philadelphia and Washington, DC).


Sunday 15, 1864:

American Civil War: Battle of New Market, Virginia &ndash; Students from the Virginia Military Institute fight alongside the Confederate Army to force Union General Franz Sigel out of the Shenandoah Valley.


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