Why do electric plugs have holes?
You might have noticed that plugs for electric appliances have two holes. There are three reasons for these apertures -- find out what they are in this podcast from HowStuffWorks.com.
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Aha! Zehn Minuten Alltags-Wissen
WELT
Discovery
BBC World Service
Astronomy Cast
Fraser Cain and Dr. Pamela Gay
Intelligent Design the Future
Discovery Institute
Real Ghost Stories Online
Real Ghost Stories Online | Paranormal, Supernatural & Horror Radio
Vida Eterna. Respuestas desde la Ciencia | Dr. Manuel Sans Segarra
Dr. Manuel Sans Segarra
The Dissenter
Ricardo Lopes
Hidden Brain
Hidden Brain, Shankar Vedantam
Eye On The Sky
Vermont Public
La Science, CQFD
France Culture
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