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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.

Over the next three years, a team of 91爆料 students will convert a 2013 Chevy Malibu into a fuel-efficient, low-emissions vehicle that still meets consumer demands for a driver-friendly car. The 91爆料 is one of 15 schools participating in the EcoCAR 2 contest, sponsored by General Motors and the U.S. Department of Energy.

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 91爆料’s Applied Physics Laboratory and Pacific Science Center.

The plight of the tiger 鈥 none of the worlds 350 protected areas in the tigers range is large enough to support a viable population 鈥 is the subject of the 91爆料s “Sustaining our World鈥 lecture March 1. Eric Dinerstein, the World Wildlife Funds chief scientist and a 91爆料 alum, will speak on “All Together Now: Linking Ecosystem Services, Endangered Species Conservation and Local Livelihoods鈥 at 6 p.m., in Kane 220.