WE have been studying the kinetics of aromatic nitration on the lines indicated in a prefatory publication 1, and in consequence have an opinion to offer on the question indicated by the title ...

Awodey, a mathematician and logician at Carnegie Mellon University in Pittsburgh, Pa., followed along as Voevodsky wrote a definition of a mathematical object using a new formalism he had created, ...

Going forward, bivalent versions of the Pfizer/BioNTech and Moderna Covid-19 mRNA boosters are what’s going to be available, replacing the original univalent ones. That’s because on August 31 ...

The bivalent vaccine was superseded last fall by a univalent vaccine against a subsequent Omicron variant. Yet limited data are available on the bivalent vaccine and subsequent univalent vaccine’s ...