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Monastersky, Richard – Science News, 1992
Researchers who study the fossil record are seeking to determine whether the impact made by a comet or meteor really did decimate up to half of the life on this planet at the end of the Cretaceous period. Questions whether the extinction of plant and animal life was abrupt, started before the impact, or was a gradual change. (KR)
Descriptors: Archaeology, Evolution, Paleontology, Plants (Botany)
Peterson, I. – Science News, 1989
Describes the theory and application of an atomic fountain which pushes the atoms by laser pulses. Discusses the applications in measuring atomic properties and in building an atomic clock. (YP)
Descriptors: Atomic Structure, Higher Education, Lasers, Measurement
