“Mars hits the sweet spot for curiosity”

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Why does Mars in particular pique our curiosity? Psychologists have found that we’re most curious when we know something about a subject, but not too much. It’s the known unknown – the gap in our knowledge. It’s called the information gap theory of curiosity. The man behind it is Professor George Loewenstein of Carnegie-Mellon University. Image: Mars. Credit: Hi-Seas Photo Gallery, University of Hawaii