The comedian Shappi Khorsandi once commented that she used the mythical concept of "sugar worms" to get her children to brush their teeth after sweets. It's a trick I poached to convince my daughter ...

Threadworms, which are a type of parasitic nematode, spend a lot of time crawling around on human skin, poking and prodding to find the best place for entry before burrowing in. But disrupting a ...