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In the image on the bottom, the eye is in the foreground and the text is in the background — and both are blurry because the photographer has focused on a point between the two. A new MIT system instead captures multiple images at several focal depths and stitches them into a sharper composite (top).

Stay focused

The Computer Graphics Group sharpens photographs by capturing multiple low-quality images instead of a single higher-quality image.

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Lab-grade economics

Can economists conduct studies with solid scientific foundations? Professor Joshua Angrist explains how to carry out 'natural experiments' with numbers.

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Economist Daron Acemoglu

Avoiding carbon copies

Can free-market enterprise generate clean-energy breakthroughs? Economist Daron Acemoglu says it's unlikely — unless government and universities help.

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