Manish Parmer leads students in a version of the “Hokey Pokey” using shapes. Turning himself around in a desk chair, Manish Parmer leads students in a version of the “Hokey Pokey” using shapes.

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Tiggly is a toy for kids who might be past the “teethe on your iPad” and just below the “I want to play the birds game” stages of mental development. Designed by a parent, Steve Miller of Cambridge, ...