The first step toward accurately measuring geologic time came at the turn of the 20th century, when French physicist Henry Becquerel discovered the natural radioactive decay of uranium.
Shortly thereafter, building on related work by Ernest Rutherford, American chemist Bertram Borden Boltwood determined that he could use the predictable decay of radioactive elements such as uranium into other elements to keep track of time.
Hartman, Tom Tucker, Joyce Kinney, Miss Tammy, Jesus, Courtney, Heather, Sandra, Scott Baio, Scott Caan, Scott Storch, Gérard Depardieu, Queen Elizabeth II Musical Numbers: Tinder is Gross Director: Brian Iles Assistant Director: Ivaylo Angelov Writers: Tom Devanney Storyboarders: Dante Leandado, Michael Rundle, Dave Sherburne Plot: When a medieval-themed restaurant building goes up for auction, Peter and the guys try to buy it but are beat out by Mayor West and his friends.
Deciding to take the "castle" the old-fashioned way by force, their flaming arrows set it on fire.
Although Boltwood's resulting estimates for things like the age of Earth¿which he placed at around 2.2 billion years¿have since been significantly revised, he indicated correctly that our planet was far older than people had imagined possible.