Helen Dooley admits that she often gets puzzled responses when she describes her work. "People say, ‘You bleed sharks for a living?’" That's an overstatement, but every couple of weeks she and a helper drop by several large fiberglass tanks at the Institute of Marine and Environmental Technology on the Inner Harbor in Baltimore, Maryland. They net a cat shark or nurse shark and wrestle it into a small pool of water that contains a mild sedative. The drug calms the shark so they can lift it from the water and puncture a vein in its tail.
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