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Cotinine standards in a buffer were used, though a blood serum spiked with 10 ng/mL of cotinine was analyzed by the CE method and the result confirmed the validity of the established standard curve

Villages with a low level of security or which didn't received agricultural assistance in the previous year were more likely to grow poppies in 2013 than villages with good security and that received assistance, the U.N

As searches for "air purifiers" spike on Google, people are posting on TikTok and Facebook about how to build the DIY air purifier

Christopher Wanjek is a Live Science contributor and a health and science writer