"Mew-on" ? Training a cat sounds like a futile exercise, unless the cat actually wants to learn whatever you are trying to teach it. I would have thought that cats would much rather learn how to teleport into birds' nests, or how to get someone to make a machine to replicate mice. There are spacetime warps everywhere, in everybody's workshops. And ask anybody with a washing machine whether they always find both socks of every pair. Either washing machines are designed to eat socks or else there is a spacetime warp in every washing machine. Have you read "Dirk Gently's Holistic Detective Agency" by Douglas Adams? If not, I can recommend it. More down-to-earth, I have read that putting a ladies' nylon stocking over the end of the vacuum cleaner tube and vacuuming the workshop is a good way to find small parts that have escaped. /Jonas