When sick people search the Web for remedies or tweet about their symptoms, they’re sending an early warning signal about disease outbreaks. Now scientists and public health officials are listening in.

From NPR: Catching Up with Flu, the perils, power and benefits of networks and our interconnectedness, both physical and virtual. File under: Epidemiology, “the study of the distribution and patterns of health-events, health-characteristics and their causes or influences in well-defined populations.”

Also, a great illustration for why we cover our mouths when we sneeze or cough. (Happily, that first sneeze made quite an impression on the kids.) Ick!

Related watching: The beautiful physics and math of sneezes.

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