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"Samantha Shires, a middle-school social studies teacher in Guilford County, North Carolina, wants her students to understand that history doesn't unfold in a series of unrelated events. "History is messy and chaotic," she says. "Students need to see how events are connected and interrelated." ChronoZoom, a free tool developed by Microsoft Research and an international team of collaborators, is helping her students visually explore the history of, well, just about everything, from the Big Bang right up to the present day."