Gypsum Sand

I love little facts like the one from a Wikipedia article on the White Sands National Monument:

Unlike dunes made of quartz-based sand crystals, the gypsum does not readily convert the sun’s energy into heat and thus can be walked upon safely with bare feet, even in the hottest summer months. In areas accessible by car, children frequently use the dunes for downhill sledding.

100-degree sledding is food for thought.

Brief Notes Nearby