PROF. ARTHUR WINFREE / SCIENCE PHOTO LIBRARY PROF. ARTHUR WINFREE / SCIENCE PHOTO LIBRARY
Two-dimensional waves of chemical change in a shallow dish containing excited Malonic acid reagant. The picture shows 2 series taken at 1-minute intervals. The circular waves are produced from nuclei of an unknown nature (possibly dust particles). Rings are produced, radiating periodically from their point sources & mutually annihilating when they collide.
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