Some people will acknowledge that, yes, they've been feeling sad, but others may describe physical symptoms — fatigue, difficulty sleeping, difficulty concentrating.

Julie Lutz

Julie Haynes Lutz (born 1944) is an astronomer and mathematician who studies planetary nebulae and symbiotic binary stars. Lutz was the Boeing Distinguished Professor of Mathematics and Science Education and director of the astronomy program at Washington State University. She moved to the University of Washington in 2000 and is now professor emeritus there.

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