STEVE HORRELL / SCIENCE PHOTO LIBRARY STEVE HORRELL / SCIENCE PHOTO LIBRARY
Electron tree. Part of an 'electron tree' produced in a block of plastic by a beam of electrons. Electrons bombard the plastic and penetrate a short distance into the block. If this trapped energy is released by a sharp blow to the block, the electrons shoot out as an electrical discharge leaving a pattern of tracks.
Model release not required. Property release not required.