Sound waves travel through particles ... What is an insulator? · How does sound travel? · How can we stop or reduce the volume of sound traveling? After watching this short film, you could ...

Researchers at ETH Zurich have managed to make sound waves travel only in one direction ... "backwards" through the first waveguide, but can do so through the third waveguide.

Sound waves can reflect off surfaces ... it needs a medium to travel through. Sound does not travel through space because space is a vacuum. If you shouted in space nobody would hear you.