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Not having enough Chinook salmon to eat stresses out southern resident killer whales more than having boatloads of whale watchers nearby, according to hormone levels of whales summering in the Salish Sea. In lean times, however, the stress normally associated with boats becomes more pronounced, further underscoring the importance of having enough prey.

A new online portal and smartphone app lets Washington and Oregon residents enter the addresses of their homes, schools, workplaces or kids’ day care centers to check if they’re in harm’s way should a tsunami hit. The tool, being publicized on the heels of the one-year anniversary of the Tohoku tsunami, was developed by researchers at the Applied Physics Laboratory.

Learn about polar bears and penguins. Center a two-foot tusk on your forehead and imagine youre a narwhal exploring your icy-ocean home. For these activities and more, grab the kids and head for Polar Science Weekend, March 1 to 4, sponsored by the UW’s Applied Physics Laboratory and Pacific Science Center.