Moguls migrate uphill

It’s a little bit tough to make out in the four-second video above, but that’s actually the slow version.

Essentially, it shows that moguls — those bumps on a ski hill that I avoid — slowly make their way uphill. It sounds counter-intuitive, but if you think about it, the explanation is clear: Skiers will push snow onto the uphill side of the mogul, and wear it away from the downhill side.

This article, where I got the video, says that they calculated a movement of approximately 8 cm per day.

Of course, I would expect that to depend on the number of skiers.