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Thomas Jefferson - Wikipedia Thomas Jefferson was born on April 13, 1743 (April 2, 1743, Old Style, Julian calendar), at the family's Shadwell Plantation in the Colony of Virginia, the third of ten children. He was of English, and possibly Welsh, descent and was born a British subject. His father Peter Jefferson was a planter and surveyor who died when Jefferson was fourteen; his mother was Jane Randolph. Radiocarbon dating - Wikipedia Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.. The method was developed in the late 1940s at the University of Chicago by Willard Libby.It is based on the fact that radiocarbon (14