Glass slipper?

No. She planted a "grass slipper." Two of them.

Thanks to Sandra Adams-Doyle of Johns Hopkins University, who sent us this photo. She said she couldn't remember what grass looked like, so she planted some in a pair of shoes "that have no business in 30 inches of snow."

They sit now on a desk in her office, where they are no doubt brightening the days of everyone who walks by - who walks buy in snow boots.