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ACROSS
1)  english psychologist whose studies of twins were later said to have used fabricated data (1883-1971)
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  the food served and eaten at one time
4)  united states writer and illustrator of children's books (1853-1911)


DOWN
1)  a lump on the body caused by a blow
2)  united states chemist who discovered deuterium (1893-1981)
3)  any rational or irrational number
4)  a message that tells the particulars of an act or occurrence or course of events; presented in writing or drama or cinema or as a radio or television program

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burt
urea
meal
pyle