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In a set of articles in the British Medical Journal, researchers debunked a number of claims for sports products. The color of urine—something athletes are told to keep an eye on—depends on many factors, not just hydration. Drinking before you feel thirsty may worsen performance. Energy drinks with caffeine and other compounds have no benefit above and beyond the boost from caffeine. And carbohydrate and protein combinations post-workout don’t improve performance and recovery.

Olympic Games 27 July – 12 August

Fingerprints can help identify you, but they can also spot if you are a smoker, drink coffee, take drugs, or have  handled explosives. Fingerprints are made up of oil and sweat, and these carry traces of drugs, including nicotine and caffeine. Tiny particles with antibodies attached, or hi-tech laboratory techniques, can spot and highlight these traces, or find very small amounts of explosives.

Read the abstract in Angewandte Chemie.

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