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.
Standard Photo Frame Sizes. Frame sizes are expressed in terms of the photo size that fits inside the frame and do not reflect the actual frame size. For example, a 4-by-6 inch frame actually measures 8 inches by 10 inches if it has a 2-inch decorative border. This is rarely an issue but should be taken into account when choosing frames for tight spaces. The table below lists standard photo and poster frame sizes.