Approximately how old was the Royal Egyptian barge that Dr. Willard Libby used to prove the theory of radiocarbon dating? When one calculates the age of an organic material using radiocarbon dating,...

Approximately how old was the Royal Egyptian barge that Dr. Willard Libby used to prove the theory of radiocarbon dating?

When one calculates the age of an organic material using radiocarbon dating, what year does the “present” year normally refer to?