There’s some evidence that the Red Planet has (relatively) high concentrations of hexavalent chromium.

So, let me get this straight. They’re talking about going to a planet that has an atmosphere with the density of a light-bulb interior, temperatures that range from frozen air to boiling platinum, a radiation environment that will turn your offspring into Godzilla and theirs into Rodan, red-dust storms with three-hundred-mile-an-hour winds, and they’re going to worry about some trace chemicals in the dirt?

When did we become such a nation of wimps?