If you've opened a Mac to upgrade a hard drive or RAM recently you may have noticed that Apple is now using blue circuit board material as opposed to the more traditional green G10-FR4 epoxy ...

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For years, the humble Arduino microcontroller—a cheap, open source, midnight-blue circuit board emblazoned with a tiny white infinity loop—has been a favorite tool of the DIY electronics crowd.

The circuit boards are used in mainframes and super computers ... the company that acquired IBM's former manufacturing operations when Big Blue began shedding a large portion of its electronics ...