I backed https://www.kickstarter.com/projects/upperstory/spintronics-build-mechanical-circuits https://www.kickstarter.com/projects/upperstory/spintronics-... a

I backed https://www.kickstarter.com/projects/upperstory/spintronics-build-mechanical-circuits https://www.kickstarter.com/projects/upperstory/spintronics-... and my 7yo is enjoying it!