Unfortunately, we aren't able to reliably date artifacts beyond several thousand years.
Scientists have tried to extend confidence in the carbon dating method further back in time by calibrating the method using tree ring dating.
We note that at the instant the swimmer touches the edge of the pool our wristwatch reads and 53 seconds.
How long has the competitor taken to swim the 1,500 metre race?
A swimming race illustrates the simple principles involved in measuring time.