Still more about sound

Today we talked more about sound.

We had a demonstration of how sound waves travel through air molecules, but don't travel in space because there is no air/atmosphere.  

We talked about how loud sounds can cause damage to our ears, but how loud sounds can be good warnings for us in times of danger.

We could see how covering our ears can muffle sounds, and how cupping our ears can help us hear sounds more clearly.

We saw how bags of sand could be used to make good (if not strange) ear protectors.

We tested how sound waves can travel down the string of a string telephone and into our ears. We even had conference calls using string telephones.