CHICAGO — One of the more recent developments in sunscreen technology is the addition of iron oxide to mineral sunscreens. Iron oxide is "an excellent pigment" that absorbs and blocks visible light, ...
Underground mining in Ohio dates back to the early 19th century, and thanks to acid runoff, the hundreds of now abandoned coal mines are a poison to the state’s waterways and ecology. To experiment ...
Art is not an afterthought, Narayan Khandekar is often fond of saying. The Lascaux caves in France, sometimes called the ...
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