HowStuffWorks, an Atlanta company, has raised $75 million in private equity from Capital Research & Management and Chilton Investment Co., to build out its instructional video site.

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It hosts videos on everything from how credit cards work to how Asimov the robot works. Also, any company will have products it wants to demo, and HowStuffWorks wants to host it in an easy place for people to get to. Often, corporate videos get lost within large corporate sites.

The company was founded by North Carolina University professor Marshall Brain in 1998, and was purchased by the Convex Group in 2003. Brain remains at the company, but Jeff Arnold, a founder and former CEO of WebMD Inc., is chairman and chief executive.