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智能手机新功能 : 地震预警

A Few Hundred Smartphones Could Catch Earthquakes Early

Early warning systems can be the difference between life and death in earthquake-prone regions, but they're expensive. The U.S., Mexico and Japan have such systems. That leaves large swaths of Central and South America, Asia and the Caribbean unprotected.

Now, scientists think one solution could be hiding in our pockets: our cell phones. Smartphones employ the latest GPS technology. So scientists tested arrays of smartphones to determine if they could measure displacement caused by the earth's shaking - and signal the subtle beginnings of an earthquake.

智能识图,人的第三只眼睛

How we're teaching computers to understand pictures

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Fei-Fei Li describes the state of the art - including the database of 15 million photos her team built to "teach" a computer to understand pictures - and the key insights yet to come.