Bugs in water, in your body and in the comments

Chris talks to John Gooderham at launch of The Waterbug App (www.thewaterbugapp.com), which helps you measure environmental health by identifying freshwater macroinvertebrates—like the ferocious water tiger pictured above.Meanwhile, Beth talks some more to Linda Blackall about the helpful symbiotic microbes on which we and other organisms depend, and Stu digs into a study from the journal PLOS ONE that found threats to people's social identity can motivate them to try and discredit scientific research through online comments.