When making a recipe that calls for uncooked beans the directions generally advise to remove any beans that float. After ignoring this for several years I decided to look into why should floaters be purged. Is is an old wives tale or a good idea?
Beans are generally a sealed legume. In order for them to float they would have to be unsealed which would let air inside thus causing them to float. These holes are cause by tiny bugs chewing their way into the bean. Though I do not think this hurts anything, just the thought of it will make me think twice about leaving floating beans behind.