[ Live Trump tests positive for Covid-19 updates and news .] Here’s what you need to know: Mnuchin and Pelosi say they are ready to try again for an economic stimulus measure. With California leading the way, the U.S. hits a new milestone: seven million cases. Rio de Janeiro’s world-famous Carnival will be delayed amid virus concerns. Novavax enters the final stage of vaccine trials. University enrollment has declined in the U.S., a report finds. Myanmar’s caseload soars, threatening food distribution, as an election nears. A virtual meeting in Argentina bared a revealing scene: A lawmaker kissing his partner’s breast. Mnuchin and Pelosi say they are ready to try again for an economic stimulus measure. Treasury Secretary Steven Mnuchin said Thursday that he and House Speaker Nancy Pelosi had agreed to resume talks on a new economic relief package. “I’ve probably spoken to Speaker Pelosi 15 or 20 times in the last few days on the C.R.,” said Mr. Mnuchin, referring to a continuing resolution to extend government funding. “And we’ve agreed to continue to have discussions about the CARES Act.” The Treasury secretary’s comments, made at a Senate Banking Committee hearing, came as jobless claims rose to 825,000 and…