Twist to the Story of the Number Line

Yupno of Papua New Guinea provide clues to the concept's origins - and suggest familiar notion of time may not be straightforward, either. Confirming a Yupno participant's understanding of numbers. All images courtesy of Embodied Cognition Laboratory, UC San Diego. Tape measures. Rulers. Graphs. The gas gauge in your car, and the icon on your favorite digital device showing battery power.
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