[nostrademons]

Cambridge and Jamaica Plain are actually more like 6 miles apart. Hell, it's a mile just to get from Harvard Square to Central Square in Cambridge.

I agree that travel time matters more than distance, though, and it'd be more interesting to see this redone in terms of "smart people per travel-minute". It only takes about 20 minutes (outside of rush hour) to get from Burlington to Needham, MA, despite them being 20 miles apart. Meanwhile, it can take 20 minutes to get from Cambridgeport to Harvard Square, despite them being about 1 mile apart.

There're similar effects in Silicon Valley - it's about 10 minutes to get from Palo Alto to Sunnyvale despite them being 7-10 miles apart, while it can be 10 minutes to get from SOMA to Market St in SF.