Part of a man's DNA. It is passed from father to son, and women don't have it. See 'Some Notes on Archaeology'.
Y Chromosome
Fact of the Day
In the Middle Ages, land could be held from the monarch in return for a service, such as holding the king's head as he crossed the Channel by boat.
Quote of the Day
"Revolution is not an apple that falls when it's ripe. You have to make it fall.
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~ Che Guevara
On This Day
1830 The Manchester to Liverpool train line opened, and caused the first train death (of MP William Huskisson).
1859 The great engineer Isambard Kingdom Brunel died.
1916 Tanks were first used on the Somme. They weren't ready for use in combat and many broke down.
1935 The Nuremberg race laws were introduced, stripping German Jews of their citizenship and forbidding them to marry Aryans.
1940 Hitler indefinitely postponed his invasion of Britain following a massive defeat of the Luftwaffe.
2008 The financial services firm Lehman Brothers filed for bankruptcy, the biggest such filing in US history, causing the Dow Jones to drop more than 500 points in a day.