MirrorCam

Computer monitors display images by emitting three narrow beams of electrons from three electron guns at the back of the monitor. These beams pass through a metallic mesh and onto dots or lines of red, blue, and green phosphorus at the front of the monitor. The electron beams stimulate the phosphorous, causing it to glow—producing a red, blue, or green dot. By reversing the process and charging the phosphorus from the outside of the monitor, and suppressing the electron beam activity by displaying a black background, it is possible to create a reverse magnetic field that will magnetize the phosphorus long enough to hold a charge for about 15 seconds. The human body produces enough energy to create such a charge. To see this in action, hold your face perfectly still from four to six inches from the monitor, stare at the green dot below for 20 seconds, then quickly click on this highlighted text to display a black and white image of your face.

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