Blogoland

David Brooks:

Thomas Kuhn famously argued that science advances not gradually but in jolts, through a series of raw and jagged paradigm shifts. Somebody sees a problem differently, and suddenly everybody's vantage point changes.

Tom Friedman:

Tipping points are sometimes more like teeter-totters: one moment you're riding high and the next minute you're slammed to the ground. Nevertheless, what's happened in the last four weeks is not just important, it's remarkable. And if we can keep all three tipping points tipped, it will be incredible.

Read more on Gladwell's appearance on "Nightline" in which he's asked whether "we know we're in the middle of a tipping point."