Vivek Goyal isn’t a professional photographer, but he and his colleagues have developed an intriguing party trick: They can capture the image of an object completely out of sight.

They demonstrated the trick in a windowless room on the Boston University campus, where Goyal works as an electrical engineering professor. In the room, a flatscreen monitor displayed a series of crude drawings created by Goyal’s graduate student, Charles Saunders. Among them were several masterpieces: A mushroom that resembles Toad from Mario Kart, a Simpsons-yellow dude wearing a sideways red baseball cap, the red letters “BU” for school pride. These are the images that Goyal and his team wanted to capture while pointing the camera lens in a completely different direction.

In the darkened room, the flickering of the screen produced a dim, blobby blur on the opposite wall. Using a camera mounted on a tripod, Saunders took 20 quick snaps of the blob, for a total exposure time of three seconds, and fed it all into a computer program. A few minutes later—voilà: A blurred image of Toad, slightly askew, popped up on their screen.

“This is not magic,” Goyal tells me, in case anyone was confused.

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Source: Wired

Source: Wired

How science may just end up killing crime

1983. Forensic scientist Steve Cordiner's first homicide.

He arrives in a Lower Hutt house to find a woman dead, her head bashed in, blood everywhere.

Cordiner opens a plastic sewing box for a "notebook, my pens, my rulers, some chemicals to do some presumptive tests of blood, and that was about it".

He uses those to study "the patterns of blood stains on the wall, to give an opinion as to the minimum number of blows that must have occurred, from where the blood was and how it was distributed".

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