Dr. Neerav Goyal, a physician at the Milton S. Hershey Medical Center

Dr. Neerav Goyal, a physician at the Milton S. Hershey Medical Center

A man holds a 3D-printed filtration mask prototype to his face.

Dr. Neerav Goyal, a physician at the Milton S. Hershey Medical Center, tests out a 3D-printed filtration mask prototype.

IMAGE: Jason Plotkin