A full-scale replica of one of the earliest programmable digital computers now fills a classroom space in Arizona, built almost entirely from cardboard and wood by students working under a teacher who credits his own dyscalculia (the math equivalent of dyslexia) for shaping how he engineers.

The life-size recreation of ENIAC (Electronic Numerical Integrator and Computer), widely regarded as the world’s first general-purpose programmable electronic computer, stretches across hundreds of square feet and mirrors the layout of the original machine that once weighed about 30 short tons.

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