Imagine waking up tomorrow and the world outside your window has no grocery store within three miles, no car to drive you there, and no guarantee that anything edible is waiting for you when you arrive. That is not a nightmare. That is Tuesday morning for a human being living forty thousand years ago. The moment your ancient ancestor opened his eyes, his brain and his body were already in conversation. Every sense was firing. The angle of the light through the trees told him something. The temperature of the air on his skin told him something. The sounds of birds or the absence of those sounds told him something entirely different.

This was not stress in the modern sense of the word. This was aliveness. Every piece of physical and mental information fed directly into a decision making loop that was faster and more sophisticated than anything we consciously experience today. Should I move? Should I stay still? Should I hunt or should I rest? Is there danger in the direction of that sound? The mind and body were not separate systems consulting each other across a slow cable connection. They were one unified instrument, tuned by millions of years of survival pressure, playing the same song at the same time.

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