Your skin is, by mass or volume, the largest organ of your body -- but it can be a little difficult to go to the gym and exercise it. The gym is for muscles. However, your most important organ can get a workout right here.

Trivia might constitute no useful information, but it does make you think.

Puzzles can be quite challenging -- and the only reward is satisfaction. But what a reward it is.

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What's with the spots? Stare at them for a moment. If some appear closer than others, then you are experiencing Chromostereopsis. It is an apparent depth effect of color that is not fully understood. Not everyone can see it. There are a number of variables that can change the perception of or eliminate the effect depending upon the individual. Learn more here.