Random Asides

Spiral Illusion

Here’s a cool optical illusion you can demonstrate with the springs from two clicky pens:

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Rebecca Watson

Rebecca leads a team of skeptical female activists at Skepchick.org. She travels around the world delivering entertaining talks on science, atheism, feminism, and skepticism. There is currently an asteroid orbiting the sun with her name on it. You can follow her every fascinating move on Twitter or on Google+.

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