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Life has evolved to thrive in environments that are extreme only by our limited human standards: in the boiling battery acid of Yellowstone hot springs, in the cracks of permanent ice sheets, in the cooling waters of nuclear reactors, miles beneath the Earth's crust, in pure salt crystals, and inside the rocks of the dry valleys of Antarctica.

The Yellowstone river is a beautiful river to navigate.

Connection between life and radioactive nuclei is straightforward. No life without tectonic activity, without volcanic activity. And we know very well that geothermal energy is mostly produced by decay of uranium, thorium, and potassium.

Geothermal can be a huge source of energy very quickly.

One volcano puts out more toxic gases - one volcano - than man makes in a whole year. And when you look at this 'climate change,' and when you look at the regular climate change that we all have in the world, we have warm and we have cooling spells.

One of the most amazing locations I've ever been is the top of the volcano in Tanzania, Africa. It's an actual volcano where you really have this lava every day.

In Yellowstone National Park, there are more 'do not feed the animals' signs than there are animals you might wish to feed.

Chicago is a sort of journalistic Yellowstone Park, offering haven to a last herd of fantastic bravos.

The grizzly bears that live in and around Yellowstone make up almost half the population in the lower 48 states, and now those bears are at risk.

Such discoveries have led me, and other geologists, to reconsider the evidence previously derived from caves brought forward in proof of the high antiquity of Man.