The Universe 25 Experiment

A mouse’s perfect paradise… or not.

Between the late 1960s and early 1970s, American ethologist John B. Calhoun created a seemingly perfect utopia for mice. Calhoun’s predator-free, disease-free enclosure was furnished with limitless food and even an upper level with miniature mouse condos. Essentially, the mice would enjoy all the modern comforts people have come to expect today.