CAPE CANAVERAL, Fla. — SpaceX brought four astronauts home with a midnight splashdown in the Gulf of Mexico on Friday, capping the busiest month yet for Elon Musk’s taxi service.

WASHINGTON — For weeks, first lady Jill Biden has been transfixed by the news coming out of Ukraine, by the bombings and scenes of “parents weeping over their children’s broken bodies in the streets,” as she said in a recent speech.

Researchers trying to learn what killed the first person to receive a pig heart transplant have found the organ harbored an animal virus. But University of Maryland doctors cannot yet say if the virus played any role in the man’s death. David Bennett Sr. died at age 57, two months after the groundbreaking experimental transplant. His surgeon says DNA of a pig virus was later found in the heart but no signs that the bug caused an active infection. Still, a major worry about animal-to-human transplants is the risk of spreading new infections.

LONDON — The World Health Organization estimates that nearly 15 million people were killed either by coronavirus or by its impact on overwhelmed health systems during the first two years of the pandemic, more than double the current official death toll of over 6 million.

The Louisiana State Police superintendent wrote himself an ominous note days after the deadly 2019 arrest of Black motorist Ronald Greene: “Realize there is a problem — must address immediately.” Excerpts of a personal journal made public Thursday show Col. Kevin Reeves considered aggressive action after his troopers beat, stunned and dragged Greene. State police didn’t launch an internal investigation for another 462 days. A legislative committee is now seeking to hold Reeves in contempt for refusing to turn over his full journals. His lawyer says Reeves is cooperating and the delays in the Greene case are not his doing.