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The atomic number of molybdenum. The element following molybdenum with atomic number 43 (technetium) has no stable isotopes.
* The number of teeth wolves and dogs (canines) have.
* 42° is the critical angle of refraction by water - it is the angle between a rainbow and the antisolar point. See The Rainbow Bridge (Sample Chapter)
* The light leaving a rainbow is spread over a wide angle, with a maximum intensity around 42°