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J-P. That's Y-A-K-U-L-T dot CO.J-P. When it comes to a guide for your gut, count on Yacult.

This is Scientific American 60-second science. I'm Emily Schweng. On June 3, a train loaded with highly volatile crude oil derailed just outside the small town of Mosier

in Oregon's Columbia River Valley. More than 40,000 gallons of crude spilled out of the train.

Some burned away in a 14-hour-long fire at the scene. Some got into the

wastewater treatment system. And some of the spilled crude oil found its way into the nearby

groundwater. Crews with Union Pacific Railroad Company and the Oregon Department of Environmental

Quality are now focused on getting that groundwater clean again.

They're using a technique called biosparging, which helps the naturally occurring microorganisms at the site consume the oil.

The biosparging relies on pumping additional oxygen underground.

And this additional oxygen will cause the population of microbes to expand

very quickly. Oregon Department of Environmental Quality Project Manager Bob Schwartz. So the more microbes,

the more quickly the oil gets consumed. Schwartz says it's unclear exactly how much oil contaminated the groundwater.

We're measuring it in hundreds of parts per billion with a B, so it's a very small mass,

but the levels are still high enough for us to have to clean it up.

Schwartz says the groundwater treatment system will likely continue for the next year.

Meanwhile, trains will resume carrying oil

through the area, a move that, according to Oregon Public Broadcasting, local fire chief Jim Appleton

called, quote, insane, end quote, at the time of the accident. Thanks for listening. For

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