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Student Wu-Jung Lee analyzed sonar echoes reflected from squid. She is trying to determine how dolphins and toothed whales use sonar to distinguish squid, which they eat, from other animals that they do not eat. In her experiments, she directed sonar pings at a squid suspended from a rotating frame. An underwater microphone received the echoes that bounced off the squid and recorded them into a computer for later analysis. Since dolphins and whales don't always encounter squid from the same direction, Lee wrote a program that enabled the computer to turn the squid through a full circle, one degree at a time. That allowed her to compare echoes from squid that were at different orientations with respect to the sonar source. (Illustration by Jack Cook, Woods Hole Oceanographic Institution)[back]
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