When the pandemic curtailed gym hours, quite a few of us moved our workouts indoors. Photograph: iStock

Five minutes of burpees, jump squats and other calisthenics significantly improves aerobic endurance, according to one of the first randomised, contro(...)

Pfizer’s Covid-19 vaccine has received the backing of an expert panel of advisers to the US Food and Drug Administration for emergency use authorisation.

Pfizer’s Covid-19 vaccine has received the backing of an expert panel of advisers to the US Food and Drug Administration for emergency use authorisati(...)

Snow blanketing Prospect Park in Brooklyn, in January 2014. Forecasters expect Wednesday’s high temperature to be minus 25 degrees Celsius in Chicago and Minneapolis. Photograph: Todd Heisler/The New York Times

A blast of Arctic-chilled air from the polar vortex brought dangerous, record-setting cold to a wide swath of the eastern United States on Tuesday, s(...)