The Antikythera Mechanism A geared bronze astronomical calculator from ancient Greece, recovered from a shipwreck in 1901 — the most complex mechanical device to survive antiquity.
Radiocarbon Dating The method of dating organic material by measuring remaining carbon-14, exploiting its 5730-year half-life and continuous atmospheric production.
Archaeological Stratigraphy The study of the vertical sequence of layers and features at an archaeological site, and the basis of excavation and relative dating.