Very informative post Mrs D, can't add much but be very careful when handling these strong magnets, don't put them close to each other they can slam together with a mighty force and if your fingers are in the way been caught many times before.
There are a lot of magnetic gimmicks out there that are expensive & useless, the magnets are to weak to do anything , the strong neodymium magnets are a different story, the power of the magnet and just as important the placement of the magnets are the key things for successful use.