RIASSUNTO
EVEN SINCE WE FIRST picked up a rock to crack open a nut or sharpened a stick to spear a fish or used a flint to create a spark to light a fire, we've been using tools. Ever since we first plaited long grasses to make a rope with which to lash together a few branches to make shelter, we've been creating buildings. From the moment we realised that some rocks split open to produce sharp edges, we've developed weapons.