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How does one experience synesthesia -- the neurological trait that combines two or more senses? Synesthetes may taste the number 9 or attach a color to each day of the week. Richard E. Cytowic explains the fascinating world of entangled senses and why we may all have just a touch of synesthesia.

"In this article, we'll help you understand what makes clocks tick, so the next time you look inside one you can make sense of what's happening. Let's get started by taking a look at the different parts of a pendulum clock."

A great Android app which shows you the many readouts of the sensors on your device. Use them in science, geography and more.