To a science-fiction filmmaker, the concept of being controlled by unseen forces is creative gold, but for the rest of us, it's a fairly unsettling prospect. But like it or not, it's clear that parasites - creatures that live off (and often control) the bodies of others - are an integral part of the world we live in and carry an influence that far exceeds their small size. Now, a painstaking survey of the residents of river estuaries shows that parasites do indeed punch above their weight, and they aren't slouches in that department either. Despite their tiny size, their combined mass eclipsed that of the top predators in the area and their influence extended wider still. It's a parasite's world and we're just living in it. Over five years, Armand Kuris and Ryan Hechinger from the University of California, Santa Barbara led...
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