In the ink: why are blue highlighter markers less bright than others?
Blue fluorescent markers are less bright than green and yellow ones. The reasons, say readers, are to do with our eyes as well as the wavelengths of light
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Blue fluorescent markers are less bright than green and yellow ones. The reasons, say readers, are to do with our eyes as well as the wavelengths of light
There has been much speculation on Twitter recently about whether we should wash our legs when in the shower. I think legs don't specifically need washing, and I suspect we overwash generally. How often should we wash, for health benefits or other reasons? (continued)