A substance is anhydrous if it contains no water, for example, salts lacking their water of crystallisation. The way of achieving the anhydrous form differs from one substance to another.
A partial solar eclipse at its peak at 3:37 p.m. in Mesa on Oct. 23, 2014. The eclipse was visible over most of North America and covered 44 percent of the Arizona sun. Michael Chow/The Republic.
A total solar eclipse last crossed Oregon in 1979, but another won't return until October 5, 2108, when a small sliver of the Oregon coast will experience the tail end of the event, and July 25, 2169, when the path of totality will include Portland and the northeastern part of the state.