Adding handles to stone tools made them more energy-efficient when chopping, increasing the 'force and precision' that could be applied to bash and scrape.
'The transition from hand-held to hafted tool technology marked a significant shift in conceptualising the construction and function of tools.'
'It is assumed that addition of a handle improved the (bio)mechanical properties of a tool and upper limb by offering greater amounts of leverage, force, and precision.'
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