A simple chemical reaction turns the red pigment of beets into a new, nontoxic blue dye.
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That pre-sleep herbal tea may be doing many people a lot of good.
Less-toxic hair dye would be a great invention. But discounting the risks that come with nanoparticles could undermine other efforts to protect human health and environmental from their effects.
This research could provide an answer to some of the problems posed by antibiotic resistance.
