A way of finding out how old volcanic rock is.
Potassium/argon dating
Fact of the Day
English law still requires that official copies of acts of parliament be printed and preserved on animal skin.
Quote of the Day
"The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy.
"
~ Martin Luther King
On This Day
1586 American colonists arrived in Plymouth with large quantities of tobacco. Smoking caught on quickly, though it was also used in tea.
1694 The Bank of England was founded by an act of parliament as a way to finance government debt by private subscription.
1943 The concentrated Allied bombing of Hamburg led to a three hour firestorm that killed approx 30,000 civilians.