To figure it out, the researchers used the Messenger data to reconstruct the two different kinds of rocks.

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Far more complex two-dimensional codes carry enough data to reconstruct a photo.

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An algorithm then crunches the data to reconstruct the hidden image.

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Since Tsarnaev's account was deleted, little of what he wrote and posted remains publicly visible, but Kayyem expects investigators to take a closer look at whatever data they can reconstruct.

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It also makes it easier to find the files that have been created, accessed and modified during an attack, and it is able to reconstruct deleted files from raw data found in various hidden parts of a computer's hard disk, such as unallocated space and file slack.

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It was difficult, however, to reconstruct the details of these events from the limited data.

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The new rule will enable the SEC to promptly and efficiently identify significant market participants and collect data on their trading activity so that the regulator can reconstruct market events and conduct investigations.

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