Hello, dear readers! Welcome to the monthly letters column. You have been sending us some very interesting mail, so we will dive right in.

Over the past few years, a new class of medications has transformed the treatment of obesity. Drugs like Ozempic, Wegovy and Mounjaro work primarily by reducing appetite, helping people eat less and ...

Thirteen million years ago, a group of medium-sized monkeys known for guarding their territory among the treetops with fearsome "howls" started doing something new. These monkeys, among the oldest ...