Stone Age share of human history

The Stone Age covers nearly all human history

~99% of human history

The Stone Age runs from the first known stone tools to the spread of metalworking. Societies based on metal occupy only a small fraction of the human past.

Water can survive longer on a hotter pan

A droplet placed on a very hot surface can briefly float on a cushion of its own vapor. That vapor separates the liquid from the metal and slows heat transfer. This is the Leidenfrost effect: beyond a certain temperature, making the pan hotter can actually make the droplet evaporate more slowly.

Papahānaumokuākea exceeds all U.S. national parks combined

~140,000 sq mi

Papahānaumokuākea Marine National Monument protects reefs, atolls and surrounding Pacific waters in the Northwestern Hawaiian Islands. Its area is greater than that of all U.S. national parks combined.

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Stone Age share of human history

The Stone Age covers nearly all human history

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