We have been learning about sound in science. Follow the links here to play the games, know about the dangers, and test yourselves:

http://www.bbc.co.uk/schools/scienceclips/ages/9_10/changing_sounds_fs.shtml

http://websrv01.kidshealth.org/kid/htbw/ears.html

http://www.nidcd.nih.gov/health/education/decibel/pages/decibel.aspx