(musing about Lake Erie West and beyond)
Ultrasonic hearing and tests
http://en.wikipedia.org/wiki/Ultrasound
http://www.ultrasonic-ringtones.com/
http://www.freemosquitoringtones.org/
http://www.noiseaddicts.com/2009/03/can-you-hear-this-hearing-test/
http://www.nytimes.com/2006/06/12/technology/12ring.html?_r=1
http://www.metro.co.uk/weird/14031-pupils-perform-alarming-feat