Isaac Newton, beyond doubt the greatest scientist in history, was born on this day, more or less, in 1642. Though Newton was a key figure in the scientific revolution, he was arguably more the last of the mystics than the first of the scientists. I say more or less because Newton lived during the time that England made the shift from the Julian to the Gregorian calendars. Newton was born "an hour or two after midnight" on December 25 Julian, which was in force at the time. When the calendar changed, that day became January 4 Gregorian. So you pay your money and you take your pick. Newton was born prematurely, and his mother, Hannah Ayscough, said he could have fit inside a quart mug. His father had died three months before. When Newton was three, his mother remarried and left her son to be raised by his maternal grandmother. In June 1661, he was admitted to Trinity College, Cambridge, on the recommendation of his uncle Rev William Ayscough, who had studied there. He started...