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"In the town where I was born and raised, everyone drove a few miles south to cut a tree. In that dry, windy country few of the cedars grew straight and full, so the major problem was to find the one least lopsided and wind-whipped."

Thus A. C. Greene, in "The Too-Big Christmas Tree," tells of a Christmas in the 1920s when his father cut a too-big tree and almost broke up the family. Long out-of-print and a collector's item, this story is now coupled with "Christmas Shopping," in which a small boy sets out with his grandmother on his first shopping trip to buy Christmas presents for the...

Low energy neutron beams are used to address many questions in nuclear physics, particle physics and astrophysics. The scientific issues include elucidating the nature of time reversal noninvariance; understanding the origin of the baryon asymmetry in the Universe; describing the weak interaction between quarks and between nucleons; and understanding the origin of the elements in stellar and big bang nucleosynthesis. This book summarizes how spallation neutron sources work and discuss the advantages of pulsed beams in reducing systematic errors in precision measurements. It also describes...