It sounds like a plot device from a comic book: a simple substance that can make the powerful weak. But it's not kryptonite. An enterprising chemist says he's found a substance—several, in fact—that work against some of the most fearsome predators in the ocean. And he wants to use his discovery to protect them. This podcast was produced by Sam Eaton for NOVA and PRI's "The World." For more global environmental stories, visit: http://www.pbs.org/wgbh/nova/earth/ http://www.theworld.org/category/topics/environment/ NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and PBS viewers.