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To learn more about this topic, start your googling with these keywords:
Acheulean handaxe: large, chipped stone objects which represent the oldest, most common, and longest-used formally-shaped working tool in human history.
Microscopy: the technical field of using microscopes to view samples & objects that cannot be seen with the unaided eye.
Microlith: small stone tool usually made of flint or chert and typically a centimeter or so in length and half a centimeter wide.
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