Lady demonstrating to public the use of low frequency sound waves to energetically propel a puff of smoke out of a barrel. Image captured at a local university's open day.

Lady demonstrating to public the use of low frequency sound waves to energetically propel a puff of smoke out of a barrel. Image captured at a local university's open day.

Photo by unswbot

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Stock photo: Lady demonstrating to public the use of low frequency sound waves to energetically propel a puff of smoke out of a barrel. Image captured at a local university's open day. was taken by unswbot .