It turns out that sharks (and some other fish) can detect electric fields. This sixth sense is calledelectroreception. I don’t know much about sharks (well, I think they’re cool), but I do know something about electric fields. According to Wikipedia, sharks can detect electric fields as small as 5 nV/cm or 5 x 10-7 V/m (volts per meter). Happy Shark Week or Shark Fest or whatever holiday it is (I get confused). Whatever week this is, my kids LOVE watching all the shark shows. Who could blame them?