That metallic-looking rainbow that often appears on sliced deli meat is known as iridescence, a phenomenon in which changing ...

A rainbow sheen from an unknown substance was visible Monday in Willis Run near Kiwanis Lake in York, and officials are trying to determine what it is and where it's coming from. Crews also are ...

Capt. Evan Clark was patrolling the Allegheny River to help Three Rivers Waterkeeper get a better understanding of just how much of a mark that fuel spill made.

Cleanup crews are now monitoring the waterways after a tanker truck crash spilled more than 2,000 gallons of diesel fuel.