It means 'before trees' and specifically refers to a time immediately after the last ice age in Britain, from about 9600BCE until about 8800BCE.
Fact of the Day
Accounts from 1350 reveal that it cost 6d a day to keep a lion in the menagerie at the Tower of London, but to keep a prisoner cost only 1d.
Quote of the Day
"A business that makes nothing but money is a poor kind of business. "
~ Henry Ford
On This Day
1660 Charles II marched into London and was restored to the throne after 11 years in exile.