Your smartphone can help you spy around corners from afar

Seeing what’s happening on the other side of a corner isn’t as impossible as it sounds. Scientists have been working on the problem for years, using lasers to bounce light off unseen objects and detect what’s going beyond their line of sight. Now, researchers from MIT’s CSAIL have gone one step further: they’re using footage from an ordinary smartphone to “see” around corners by spotting subtle changes in light and shadow.
The premise of the work is simp