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Computer scientists say our brains have a storage capacity approximately the same as an 11-terabyte hard drive, which with current solid-state technology can be stored in an area about the size of a fingertip.
Our eyes are each equivalent to a 137-megapixel camera, roughly ten times higher resolution than a typical modern digital camera.
These comparisons are a bit rough, because humans are made from wetware, not hardware. For instance, the retina has much greater sensitivity near the center than at the edges, while a camera has uniform sensitivity. The memory of a hard drive is digital. Each ‘cell’ in a hard drive can hold a one or a zero. Each cell in the human brain is more of an analog mechanism, firing or not based on many input factors.
You can run this program to find out whether you are colorblind. Approximately 12% of males are colorblind. Although fewer, millions of women are also. And if you are colorblind, you can play with this a few minutes a day as an exercise to discern colors better.
These two similar words can have vastly different meanings. A naturalist is one who studies or appreciates nature. A naturist can be nearly the same thing: One who appreciates beauty in nature. However a naturist can also be one who enjoys going without clothes whenever proper opportunities come up. There can be a sexual side to naturism, but more often it is practiced as a way to be more ‘natural.’ Naturism can be a very freeing experiece for one who has spent most of life covered in cloth. Many claim health benefits, feeling a reaonable amount of sunshine over one’s entire body is more beneficial than exposing only some portions of the body to the sun’s ultraviolet radiation. A growing body of evidence suggests most of us don’t get enough vitamin D. However, some scientists are now saying as much exposure as one can get to sunlight will not give us optimum vitamin D. On the other hand, too much tanning can be bad for one’s health also. Go figure!