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What kind of tests do they think would be good to conduct next and why?You can connect the idea of to changes in bacteria populations if you care to.After a flood for example, the biggest threat is disease due to polluted water, from overflow of sewage mixing with drinking-water supplies.

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Today’s activity was mat ball, a variation of dodge ball involving lots of kids and lots of contact with balls and mats.

First consider the scenario: The class arrives from physical education.

They’re pumped, a little sweaty and out of breath, and one or two are a few seconds late—probably not because they were washing their hands! We accept a certain lack of sanitation mostly because it’s not feasible to allow 26-30 kids to wash their hands several times a day. Researchers were surprised to find the incredible number of different bacteria species found among 51 college students’ hands and the very low number of species shared by all students.

Would you have students wash their hands in this scenario? We try to take solace in the hand sanitizers, though rumor has it there’s no substitute for warm water, soap and a minute of scrubbing. Photo by Eric Erbe, digital colorization by Christopher Pooley, both of USDA, ARS, EMU. Further, there was a difference between left and right hands.

Low-temperature electron micrograph of a cluster of E. And finally, there was a significant difference between men and women. The average hand harboured 150 species of bacteria. Researchers suspect differences between left-and right-hand bacteria diversity have to do with each hand’s interactions with environment that can alter the hand’s conditions in terms of oil or salinity, for example.

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