It's stories like this one about Yellowstone that make me realize just how little control over some things we really have:

The elevation of the caldera is 35 inches higher than when measurement began in 1923, and it has been moving upward since mid-2004 at a rate of up to three inches a year - more than three times faster than has ever been measured previously.

An explosion matching the last Yellowstone eruption, which released 60 million times the energy of the Hiroshima bomb, would most certainly result in millions or even billions of deaths worldwide, both directly and indirectly.

In geologic time terms, the odds of it exploding in my (or any given) lifetime are small. Still pretty sobering.