If you go to the MAP and zoom in east of the Mississippi you can see big data at work. To understand consider this.
Biff pulled his rig under the canopy and began filling her up with diesel. Walking into the store the little sleigh-bell on the door-frame announced his entrance. A couple of hot dogs and a big plastic cup of iced colored water Biff walked to the counter with his purchase. He watched the breasts of the store clerk jiggle as she turned to face him.
‘How is your day going’ he said.
Fine, how’s yours?’ she said as she rang up the items and took Biff's card. She bent close to check the out of state ID in his wallet against the card. Handing it back and pointing to the customer keypad she said.
‘Eight twenty nine’
Biff swiped the card and entered a code.
Handing Biff his receipt the clerk said,
‘Thank you, have a nice day’ Biff replied
‘You too’
And Biff was gone.
Susan got off work an hour and a half later and felt fine for four days. She rents a trailer across the tracks on the other side of town. The town which appears as a dot smack in the middle of an interstate on the MAP.
Conspiracy theory, you decide. Zoom in and out on the map. Pearls on a string.
Big Data is the infection city data point matched to a city which is shown with a major traffic artery going through or next to it. At this time cities too far from major traffic arteries are so less affected that the map shows how the virus was transmitted. The clarity of the relationship will soon not be apparent as the virus spreads evenly from where it has been seeded.

The story happened a month ago. Susan finally got sick enough to get on the Radar. The map is actually showing things delayed by an incubation period and transmission is actually already more dispersed. As things turn out if you go to the live map today the pattern is even more clear than this snapshot which I took yesterday.