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Next time you see someone hacking up a lung, do a double-take. Why? Just looking at a sick person may boost your immune system.

Canadian scientists asked 28 study participants to view photos of people coughing and sneezing… and then they tested their blood. The result? Their white blood cells contained 24% more cytokines – the proteins that improve immune response. They believe it’s an automatic defense to help you keep from catching whatever the sick person’s got.

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