Modern dating methods
One of its great advantages is that any sample provides two clocks, one based on uranium-235’s decay to lead-207 with a half-life of about 700 million years, and one based on uranium-238’s decay to lead-206 with a half-life of about 4.5 billion years, providing a built-in cross-check that allows accurate determination of the age of the sample even if some of the lead has been lost.
he question of the ages of the Earth and its rock formations and features has fascinated philosophers, theologians, and scientists for centuries, primarily because the answers put our lives in temporal perspective.
This has caused a lot of confusion as guys today are often unsure if they should pay the full bill or not.
But nowadays it’s common to see couples splitting the bill.Dating can now be performed on samples as small as a billionth of a gram using a mass spectrometer.The mass spectrometer operates by generating a beam of ionized atoms from the sample under test.There is however an exception to this rule: If the girl invites you out (especially if she takes you someplace way out of your price range) you’re fine simply offering to split the bill.It’s not your obligation to pay for her when she’s the one extending the invitation.