An 1842 Photo Technique Still Has Its Charms

Decades ago, when my brother was first hired out of graduate school, one of their Swiss clients was kind enough to send him a hands-on science-gift every Christmas. And my sibling was in turn generous enough to give them to me. When he no  longer worked for the company that was linked to that benefactor,... Continue Reading →

UV: Practical and Philosophical Perspectives

In the same manner that the frequency of visible light plays a role in the color we perceive, or in the way a broadcasting radio frequency characterizes a particular radio station, the specific frequency of ultraviolet light(UV) affects its behavior towards living cells. Before elaborating on that point, let's look at some characteristics and origin of UV.  Ultraviolet radiation has... Continue Reading →

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