What contributes more to the attractive force between a magnet and a thin piece of metal - the magnet's surface area, or its thickness? [more inside]
posted by howling fantods on Nov 5, 2009 - 5 answers

After seeing them used on MythBusters, I purchased a number of super strong neodymium 'rare earth' magnets. My legitimate practical reasons for using them have run out. Suggestions? [more inside]
posted by Grensgeval on Jun 2, 2005 - 19 answers