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Sit-Downs Still Better
Gomberoff may be on to something, though, and statistical physics may eventually be used to understand the dynamics of blended families. Until this happens, however, divorcing parties are better off sitting down and talking with each other. 70 more words
A demonstration of normal sight, short-sightedness and long-sightedness. The correction of the conditions may be carried out by varying the focal length of a corrective lens.
There is a piece of glass that can be altered in shape to become either a convex or a concave lens showing how the beams converge and diverge accordingly.