Once you own a digital camera, you can take extra images for negligible cost. Don’t use the capability to take nearly identical pictures of the same subject. That just clogs up the editing pipeline when dispose of them later. One of the worthwhile uses of free images is capture signs and brochures that describe the subjects of your photos. Visiting the Arizona-Sonora Desert Museum near Tucson, Arizona, I took this photo of an unusual plant called willow groundsel. This picture doesn’t reveal what is so unusual, but a photo of an accompanying sign keeps the memory alive.