Mindy's Noodle Caboodle Truck

There was a recent peer-reviewed scientific study in the journal Science Advances. Can anyone guess what these scientists use for their experiment? Oh, I know. Everybody knows it's science, fella. You got to guess more specific. They used something found in this noodle caboodle truck here. Uh, um, car keys. No, wait. It's motor oil. Why don't you just tell them, Mindy? And now we eat.