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I recently saw in interesting project in a book that involed using an old hardrives magnets, and coils to build an interesting robotics project. Search for beam magbots. Maybe you can find it if not there is a book. I forgot the name.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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