By contrast, Gartner and IDC, who are better-known for tracking the PC market (and presumably thus more conservative in their methodology), do not (yet) count iPads as PCs.

FORBES: Five Reasons Why Tablets Like the iPad Are PCs

By contrast, the sharing of data among European astronomers who took part in the tracking of the 1680 comet looks surprisingly modern.

BBC: A Point of View: Crowd-sourcing comets

In contrast, high-income countries in Europe and the U.S., where population tracking is more reliable, grew relatively slowly.

FORBES: The World's Fastest-Growing Megacities