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Build yours at home

Break it, fix it

Build this one with dough. Follow Play-dough circuits, steps 1 and 2: light the LED, then pull one leg out to break the loop.

Play-dough circuits · steps 1 and 2

Talk while you build

  • Can you trace the whole loop with your finger?
  • Where is the break when the light goes off?

Spot it at home

  • Light switches, the button on a flashlight, the toaster lever, and the button inside the fridge door that turns its light off when the door closes.

When you flip this switch, where's the gap?