His departure came days after the company cut 30 percent of the staff. He will be replaced in the interim by Jeff D’Onofrio, the chief financial officer, the company said.

Mr. Lutnick had claimed to have distanced himself from Jeffrey Epstein even before the disgraced financier was convicted of a sex crime in Florida.

Scientists on the Thwaites Glacier attempted to install equipment beneath the ice to better understand how it is melting. Our climate reporter Raymond Zhong walks us through their landmark experiment and the bittersweet outcome.