Several readers politely pointed out that I was an idiot in an article about the high-voltage DC power lines proposed for Northern Pass, switching the positions of Nikola Tesla and Thomas Edison in the AC-DC wars when the electricity industry was first getting established.

The really embarrassing part? I made this same stupid mistake in another article a couple of years ago.

The historical error came at the very end of a story, so it’s an interesting audience survey, showing how many people actually read to the end and knew enough to point out the mistake. At least, that’s what I’ll tell my boss …

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