Getting Particular About Particulates

     Even our relatively small school parking lot offers an array of different vehicles . . . and that's what Ms. Younger and her 7th grade scientists needed for testing the particulates produced by different engine types.  They took exhaust samples from . . .
     one of our school buses,
     a large and old Ford pick up truck,
     a Subaru Crosstrek, and
     a Prius.

Then, it was back to the lab, and under the microscopes, to take a closer look at the different particulate levels produced by the four different engines.