Standing on a thin ledge of rock, just below Hell’s Gate rapids on the Fraser River in British Columbia, William Ricker dips his net into the eddy at his feet. He brings up a big sockeye salmon for tagging. This one is fresh and strong, not like the tired ones who are having trouble with the rapids. Again and again the weak ones find their way into his net. From a pocket, Ricker pulls out two...

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Q: Since a plane's wing is designed to fly right side up, how does a plane stay up in the air when it is flying upside down?

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In the news

Take two parasites and call me in the morning

July 26, 2014

Two recent papers suggest that some parasites may be good for us. UBC botanist Laura Wegener-Parfrey and Julius Lukeš of the Canadian Centre for Advanced Research question our traditional perception of intestinal parasites. The papers offer a systematic review of cases where humans have deliberately ingested parasites for research and suggest that certain parasites could have beneficial effects on conditions such as Crohn's disease and Irritable Bowel Syndrome. More at Science Media Centre of Canada.

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