It may be that this was Mr bin Laden's plan: to revive the idea that Islam and the West are doomed to collide and make the idea into a self-fulfilling prophecy.

ECONOMIST: Much has been achieved, but things are now going badly

Once televisions and computers collide, Siri will make browsing the internet on your TV from your couch much more convenient.

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To make such planets, a star needs solid material pieces of rock interspersed with iron that can collide and stick together and not just gas.

ECONOMIST: Planetary formation