We moved from muscle power to mechanical power.
Our cranial capacity tripled, trading raw physical strength for the ability to process complex patterns and abstract thought. 15 : The Culmination of Two Million Years
By mastering fire, we "outsourced" our digestion, allowing more energy to fuel our growing brains. We moved from muscle power to mechanical power
We moved beyond simple signals to complex syntax, allowing us to pass knowledge across generations—a process called cultural evolution . 2. The Great Acceleration we "outsourced" our digestion
Creating a "second intelligence" that mirrors our own cognitive processes.