Does Elon Musk have the coronavirus? After four tests, he still doesn’t know.

Elon Musk, the SpaceX chief executive, has tested positive twice, and negative twice, for the coronavirus after taking four rapid virus tests, he revealed in a disgruntled tweet early Friday morning. The announcement came just days before his company’s much-anticipated launch of a Crew Dragon capsule that will carry four astronauts to the International Space Station.