
A
good two million years ago, one hairy Homo habilis smashed a rock against
another rock. Things have been very complicated ever since.
Modern humans are incredibly well trained when it comes to mechanical
systems—things like rocks smashing into other rocks. As a kid, you learned
pretty quickly that objects have mass: the more mass they have, the harder
they are to push. You learned to stay away from falling plates in the kitchen. You
knew the faster you bicycled, the easier it became to balance. Unfortunatel ...