Newton, faced in May 1686 with Hooke's claim on the inverse square law, denied that Hooke was to be credited as author of the idea. Among the reasons, Newton recalled that the idea had been discussed with Sir Christopher Wren previous to Hooke's 1679 letter.
Gettysburg is a borough and the county seat of Adams County in the U.S. state of Pennsylvania. The Battle of Gettysburg (1863) and President Abraham Lincoln 's Gettysburg Address are named for this town.
York County PA Real Estate. Find the latest homes for sale in York County, PA below! York County occupies space outside of Harrisburg in the north, and includes the Mason-Dixon Line in the south, which separates Maryland and Pennsylvania. This county is also bordered to the east by the Susquehanna River.