With its loose, bunchy skin and sun-starved complexion, the naked mole-rat (Heterocephalus glaber) recalls an uncooked bratwurst dried on permanent press—and it might be one of the last creatures ...

There is a common misconception among educators, and even some metrologists, that the Avogadro constant _N_~A~ is (or should be) a pure number, and not a constant of dimension *N*^–1^ (where *N* is ...