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It took humans some 300,000 years to figure out that rolling something was easier than carrying it. Just as it's hard to believe that the iPhone hasn't been around for 20 years yet, it's just as hard to believe that we've only been using wheels for some 6,000 years.

And it's odd how few power station manufacturers put wheels on their units (and when they do, they feel like a compromise). They still expect you to lug around 80-pound lumps like a prehistoric cave dweller.

Also: I tested DJI's tiny 4K action camera for weeks - and now I'm ditching my GoPro for it