Most of us first spot them as children—the white lines in the blue sky that are the telltale sign of a flight overhead. Contrails are an instant visual reminder of air travel, and a source of much ...

The Salt Lake School District took the extraordinary step of informing parents that they've got their backs—sort of. The message from on high is that your president and his minions are coming after ...

Pratt & Whitney has presented the results of its HySIITE program, which shows how water recovery can boost efficiency and ...

Conspiracy theorists came out in force Tuesday afternoon to support a Republican bill that aims to ban “geoengineering,” ...