It could be that being a risk-taker drives you to play more games, or that some external force makes you both play games AND be an unsafe driver.

FORBES: New Study Claims Gamers are More Unsafe Drivers

The problem occurs when external force causes a baby's head to take on an abnormal shape.

BBC: Molly Askam

The risk must be that whatever government emerges will only prove an interlude before a fresh crisis, in which external pressure once again is required to force Rome to confront the Italian economy's structural shortcomings, perhaps in return for a deal with the European Central Bank to support the government bond market under its Outright Market Transactions program.

WSJ: Post-Election Inaction Could Reawaken Crisis

The coil is suspended in an external magnetic field and the current running through it adjusted so that the attraction between the two magnets balances the gravitational force on the suspended mass.

ECONOMIST: Weighing a kilogram