Hearing both channels of audio in one earpiece

Q: For safety’s sake, when riding my bike I would like to listen to my iPod with one ear free to hear traffic, etc. Is there such a thing as a mono earbud, so I can hear both channels of audio?

– Evonne

A: An inexpensive adaptor such as this one from RadioShack will send the left and right channels of iPod audio to both earpieces on any stereo headset.

This sort of adaptor is also very useful to those who are deaf or near-deaf in one ear.