Under this theory, the atlatl or spear-throwing stick was invented 18,000 years ago as a response to a Malthusian crisis, not just because it seemed like a good idea.

• 按这种理论推断，18000年前发明的一种叫“atlatl”的梭标投掷棍，并非仅仅因为好使，它其实是应付马尔萨斯危机的产物。