There's lots of hard problems in epidemiology, but "how do we keep track of the movements of hundreds of millions of people in real time without their consent" is a freebie.
-
-
Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.