This tiny nation on the north coast of South America is about to become the world’s newest petrostate—and potentially the richest. In 2015, Exxon Mobil Corp. made what one of its executives described as a “fairy tale” discovery in the vast Stabroek exploration block off the Guyanese coast. Since then, it’s found so much oil […]

Lack of certain antibodies would mean you don’t have an “immunity passport” and are therefore not allowed to venture out in public. Those who have them would be issued certificates to roam and restart economies — so the vulnerable can stay home.

Each of the V-shaped structures is a collection of stiff hairlike protrusions that bend back and forth in response to vibrations from sound pressure waves. The three prominent rows show the hairs of the receptor cells that detect very weak vibrations and amplify them so they can be better detected by the cells in the […]