The School Nurse's Bane: Head Lice

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The School Nurse's Bane: Head Lice
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Here's what you might not know about these banes of childhood: Though other species of lice infest other mammals and even birds, Pediculus humanus capitis lives on the human scalp and nowhere else. A louse spends the first week or so of its life as an egg, or nit, before hatching into a nymph. Over the course of about seven days, the nymph will molt three times, growing bigger each time, until it reaches the adult stage.

Meet the Microscope Made from Paper

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Meet the Microscope Made from Paper
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Individual Foldscopes, as Dr Prakash dubs them, are printed on A4 sheets of paper (ideally polymer-coated for durability). A pattern of perforations on the sheet marks out the 'scope's components, which are colour-coded in a way intended to assist the user in the task of assembly—for the Foldscope has no written instructions to guide, or possibly frustrate, the user.
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