Today we celebrate the birthday of Sir Isaac Newton, born this day in 1642 (old style Julian calendar). Newton remains one of the true giants of science, having discovered that gravity affects celestial bodies according to the same laws that we observe on Earth. Newton’s laws are still used by NASA today when sending vehicles into space - an amazing achievement for the seventeenth century.
So kick back today and raise a toast to Sir Isaac. And remember, Newton was actually born on December 25th, unlike, er, that other guy whose birthday is also celebrated by many today.