The pilot must then change the pitch of his craft to let it enter a mode called autorotation, in which the rush of air as it descends keeps the blades whirling, thus providing lift that slows the fall.

ECONOMIST: Monitor

The Flex tracks your sleep quality as well, but the approach here differs from other Fitbit products: whereas the Fitbit One and Fitbit Zip have a key you can press to enter sleep mode, the Flex has no buttons at all, so your only recourse for logging sleep is to use the app or website.

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Consumers enter full panic mode, increasing savings against the eventuality of a job loss.

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Interestingly, the command caused the befuddled craft to think that one of its solar panels was "stuck, " which eventually led to an autonomous decision to enter "safe mode, " followed by a complete shutdown of the unit's onboard batteries.

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