Universe 25- John Calhoun's NIMH experiment

Leading up to 1972, John B Calhoun conducted a series of experiments under the guidance of the National Institute of Mental Health (NIMH). In these experiments Calhoun observed rats and mice populations coping with various living situations and environments. <br> <br>These experiments culminated in Universe 25; a mouse utopia which lasted 600 days and ended in the extinction of all inhabitants. <br> <br>http://www.cabinetmagazine.org/issues/42/wiles.php <br> <br>https://en.wikipedia.org/wiki/Behavioral_sink <br> <br>https://en.wikipedia.org/wiki/John_B._Calhoun