Unfortunately, we aren't able to reliably date artifacts beyond several thousand years.
But it is already clear that the carbon method of dating will have to be recalibrated and corrected in some cases.
Since 1947, scientists have reckoned the ages of many old objects by measuring the amounts of radioactive carbon they contain.
New research shows, however, that some estimates based on carbon may have erred by thousands of years.
We will deal with carbon dating first and then with the other dating methods.
Carbon has unique properties that are essential for life on Earth.