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00:41:34
Produced by students from San Francisco's Aim High Program. Today they ask, how do our ears work? Can we communicate without words? How do whales communicate under water? Why don't bats slam into trees as they fly? Middle school students will interview Exploratorium Educator Ken Finn and Biologist Dr. Karen Kalumuck, plus special surprise guests!

12:25:46
Why do many things sound different underwater? How are echoes made? Can you feel or see sound? Join us as we delve into the mysteries of sound. This webcast will feature an Aim High student demonstrating how to make a membranophone; Exploratorium physicist Dr. Paul Doherty modeling sound with ringing aluminum rods, corrugated plastic whirlies, and a slinky; and Marco Jordan, lead educator in the Exploratorium's Outreach program, demonstrating sound science with a "whine" glass and a singing bowl.