Long before Steve Jobs helped build Apple into one of the world’s most influential technology companies, he was already experimenting with electronics.

A science project Jobs created while he was in eighth grade has now resurfaced decades later, offering collectors a rare glimpse into his early interest in technology.

The project, titled “What is the Silicon-Controlled Rectifier?”, is part of an auction of Steve Jobs and Apple memorabilia marking Apple’s 50th anniversary.

The collection includes vintage computers, signed documents, advertising material and other objects connected to Jobs and Apple’s early history.From Steve Jobs’ school science fair project to a sought-after piece of Apple historyThe project dates to February 29, 1968, when Jobs was an eighth-grade student.

Rather than producing a conventional school display, he chose to explore the silicon-controlled rectifier, or SCR, a semiconductor device used to control electrical power.