Some teeny-tiny parasitic roundworms called nematodes have an unerring ability to leap high into the air to land on fruit flies and other living prey. It turns out that the prey unwittingly give the nematodes a hand, new research shows. By simply moving, a fly builds up an electric charge. Like static electric cling, that charge can pull a nematode in. In this experiment, researchers applied an electric charge to a pinned-in-place fly. A speck of a nematode (left) cartwheeled into the air and then headed straight for the fly.
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Video: Víctor M. Ortega Jiménez

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