The opinions expressed in this commentary are solely those of Jothy Rosenberg.

CNN: Amputees never say 'I can't'

That is a question addressed by Isabelle Dean and Michael Siva-Jothy of Sheffield University, in Britain, in a paper in Biology Letters.

ECONOMIST: Body hair

Ms Dean and Dr Siva-Jothy were testing the idea that fine body hairs (known, technically, as vellus and terminal hairs) are there to alert their owner to creepy crawlies such as bed bugs, which might be intent on biting them, and that the hair may also get in the way of such arthropods' activities, giving the owner more time to react before he is bitten.

ECONOMIST: Body hair