MxT, or ‘Memory x Time,’ is one of the formulas acclaimed poet Sina Queyras posits as a way to measure grief. These poems mourn the dead by turning memories over and over like an old coin, by invoking other poets, by appropriating the language of technology, of instruction, of diagram, of electrical engineering, and of elegy itself. Devastating, cheeky, allusive, hallucinatory: this is Queyras at her most powerful.