Awesome." However, shortly after arriving they find out the truth: they are actually being entered into a "charm school" which focuses on teaching them how to behave as boyfriends.
Radiometric dating of granitic intrusions associated with the Caledonian orogeny yields ages between about 430 million and 380 million years.
The igneous activity that produced such intrusions...
Chris Lepre of Columbia University's Lamont-Doherty Earth Observatory (back to camera) precisely dated the artifacts by analyzing layers above, around and below them for reversals in earth's magnetic field.
Our ancestors were making stone tools even earlier than we thought -- some 700,000 years older.
Most notably, production dates have been penciled or stamped on the butt end of the heel of the neck of most guitars and basses, although there were periods when this was not consistently done (1973 to 1981, for example) or simply omitted.