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    • Tiger beetles mimic ultrasound to warn off bats

      Cosmos· 1 day ago

      More fascinating behaviour from the insect world has been revealed in a study of tiger beetles and how they try to avoid bats, which see them as a hearty meal. Most bats rely on echolocation ...

    • Search | T2 Portal

      NASA· 6 days ago

      Glenn's innovative DELTA convertor uses a double-action push/pull piston, in which an acoustic wave - or sound wave generated by heat ...