Thursday, January 27, 2011


What do the 16 digits on a credit card mean?

Dr. Larson asks, "Is There Logic To Support Pakistan's Blasphemy Law?"
"The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny."  This sliding scale will help you see even smaller!

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