On his return from China-last-week, Dr. Ian-Lipkin quarantined himself in his basement. His wife now puts his food on the stairs. He's run-out of things to watch on Netflix. At odd hours, he walks in New York's Central-Park, keeping 10-feet away from others. Lipkin is among hundreds-of-people in the US and thousands around the world who, although not sick, live in semi-voluntary-quarantine at home.