Teen-repellant
Wednesday, November 30th, 2005 I don’t normally post links to stories elsewhere, but I thought this was worthy of that honour, and a brilliant simple solution to a problem around the world.
http://news.com.com/2102-11395_3-5974937.html?tag=st.util.print, from which:
The device, called the Mosquito (”It’s small and annoying,” Stapleton said), emits a high-frequency pulsing sound that, he said, can be heard by most people younger […]