Chief Justice John Roberts asked the city's lawyer how long he needs to switch off his trigger lock (which requires entering a three-digit code) when a criminal is climbing through the window.

ECONOMIST: The Supreme Court hears a crucial case

And that's how a thunderstorm off the coast of India might trigger a pattern of events which led to the weather switch last spring.

BBC: Met Office three-month forecast was 'not helpful'

Alonso's switch to Ferrari had been the worst-kept secret in F1, and the announcement is likely to trigger a string of driver moves.

BBC: Ferrari confirm capture of Alonso

For example, Zeneca has managed to switch the bt gene, which gives maize plants resistance to nasty insects, on and off using another chemical trigger.

ECONOMIST: Terminator genes