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The energy may be acoustic, pressure waves, you've probably heard of LRAD devices (or long-range acoustic devices) -- devices they've discussed in the press -- so ultrasound is one mode that could be used for this. We also could have radiofrequency. We could have microwave. We could have light -- lasers are an example of it. I'm going through these just as examples, i want to make it eminently clear that we don't know what they were exposed to and certainly can't make any inferences as to whether it was deliberate or inadvertent.