http://www.independent.co.uk/life-style/health-and-families/picking-nose-healthy-good-for-you-children-parenting-study-mucus-bacteria-a7702671.html
Makes sense to me, though I'm not a qualified bogey research professional.
@Dugtheslug started
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http://www.independent.co.uk/life-style/health-and-families/picking-nose-healthy-good-for-you-children-parenting-study-mucus-bacteria-a7702671.html