Science: The Deadly Kiss

Up the little rivers that feed the Great Lakes, an evil invader was swarming last week by the slithering thousands: the sea lamprey. It looks like a mottled, bluish eel, but instead of a proper mouth it has a round sucker, like the rubber gadget that plumbers use to unplug drains. Inside the rim are rows of small teeth. When a hungry lamprey spies a fish, it darts to the fish's side. The sucker's teeth dig in and get a firm grip. Then the lamprey worries a hole in the fish with a file-like...

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