INSTANT HOLOGRAPHY Polaroid succeeded in creating instant photography, the appearance of an image very soon after exposure. Now scientists at the Risoe National Lab in Denmark (P.S. Ramanujam, p.s.ramanujam@risoe.dk, 011-45-4677-4507) have done the same for holography. They have devised a photosensitive polymer (azobenzene) in which blue-green laser light can record an image in a matter of nanoseconds without any chemical processing. Applications for this type of process would be 3D hologram movies, waveguides for instantly reconfigurable optical switching, and for tracking the movement of particles. (P.S. Ramanujam et al., Applied Physics Letters, 24 May 1999.)