The body obtains vitamin A in two ways. One is by manufacturing it from carotene, a vitamin precursor found in such vegetables as carrots, broccoli, squash, spinach, kale, and sweet potatoes. The other is by absorbing ready-made vitamin A from plant-eating organisms.
It takes a really good glue to hold picture frames together. The common glues that you see in hardware stores just don't cut it. Picture frames glued up with these glues will snap apart very easily. Because these picture frame clamps are not professional vises, it is even more important to use a really good glue.
For lots of budding craftsmen and women, learning how to build a picture frame serves as an excellent lesson in basic woodworking principles. In a previous article, I showed you how to build a simple tablesaw sled for the construction of 8x10 picture frames.