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In Metal Evolution, music documentarian Sam Dunn, right, interviews headbanging legends like Judas Priest screamer Rob Halford.

Sam Dunn and Scot McFayden are to heavy metal documentaries what Spielberg and Scorsese are to quality drama. Except these two work together.

The Banger Films duo, who made award-winning docs Iron Maiden: Flight 666 and Rush: Beyond the Lighted Stage, are thrashing their way through musical history with an 11-part TV series called Metal Evolution. If you haven’t made it appointment viewing yet, put down your Mastodon record and find the DVR remote.

“When we did our f...

Iceland plays its geothermal ace in the high-stakes green data center market. Photo: Verne Global

The amount of data the world stores is on an explosive growth curve. According to research outfit IDC, the digital universe will grow 44 times larger over the course of the decade, thanks to the rise of worldwide obsessions with things like social media and cloud computing. And that means more data centers.

But this data center boom comes at a time of high energy prices and heightened concern about carbon emissions. The days of cramming truck loads of servers into a room and firing up a bunch of...