CLUES ACROSS 4.    Energy, force. 7.    Scientific work in new fields. 8.    A source of salt. 9.    A unit of electrical resistance. 11.    A new exercise carried out by a scientist. 12 & 13 A serious problem affecting forests. 14.    Carbon monoxide. 16.    Where many scientists do their work. 19.    Very small unit of living matter. 20.    Unit of electrical power. 21.    Liquid necessary for most forms of life.

CLUES DOWN 1.    Without it, things remain theories. 2.    To become solid. 3.    Mr. Nobel created one for physics. 4.    Men whose field of work is physics. 5.    Unwanted matter. 6.    It occurs when certain chemicals are brought together. 10.    The profession in which we find doctors and nurses. (adj.) 12.    Chemical symbol for a precious metal associated with the Klondike. 15.    Functional part of a living body .

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