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#JustCurious What powers a train whistle?

They’re loud and they’re supposed to be. Trains in Canada, travelling below 70 kilometers per hour, are required to sound their horn for at least fifteen seconds at public grade crossings.

A Canadian Pacific Rail maintenance worker climbs onto a locomotive at the company's Port Coquitlam yard east of Vancouver, B.C., on Wednesday May 23, 2012. THE CANADIAN PRESS/Darryl Dyck

#JustCurious What is an atmospheric river?

During coverage of the devastating floods in B.C., an atmospheric river was referenced as the reason for all of the rainfall. Our viewer Shawna was #JustCurious what the term means.