Stone tools provide some of the earliest evidence for what we might consider human behaviour and have been made more or less continuously since the first human-like ancestors appeared.
Looking for lithics; identifying manmade flint tools
When a piece of flint, or core, is struck with sufficient force a fracture is initiated from where the blow lands and travels through it until it re-emerges on the surface elsewhere.
:max_bytes(150000):strip_icc()/African_adzes-b188309534a444169a1843aae08241e0.jpg "Flint tools identifying Identifying Stone")
