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Jasmin Merdan/Getty Images People across cultures can tell when others are in the early stages of infection by looking at them. Artin Arshamian at the Karolinska Institute in Sweden and his colleagues tested whether it was possible to tell if someone was sick just by looking at their face. They worked with 169 volunteers from six different cultural backgrounds, including city-dwellers in Stockholm and hunter-gatherers in the rainforests of Thailand and Malaysia, and in the coastal deserts of Mexico. Each volunteer was shown photos of Swedish people taken two hours after they had been injected with either E. coli or a placebo.

United statesJoshua tyburJasmin merdan gettyKrista charlesKarolinska instituteVu university amsterdamஒன்றுபட்டது மாநிலங்களில்கிறிஸ்டா சார்லஸ்உ பல்கலைக்கழகம் ஆம்ஸ்டர்டாம்