They did it fore the last 200019 years since 82bcg
The classic seven wonders were:<span>Great Pyramid of Giza.Hanging Gardens of Babylon.Statue of Zeus at Olympia.Temple of Artemis at Ephesus.Mausoleum at Halicarnassus.Colossus of Rhodes.<span>Lighthouse of Alexandria.</span></span>
¿Esta es una pregunta o qué?
Because <span> The half-life of carbon-14 is around 5,700 years. So, by measuring the half-live of the sample, we could predict how old the sample actually is.
</span><span>After 50,000 years there is probably less than 1% of the original C-14 left which make it much more accurate to measure, so, the upward limit is put on 50,000 years.</span>