Silver, gold, copper, graphite, salt water.
Most metals are good conductors of electricity. Copper is popular because it is one of the best conductors, malleable, and relatively inexpensive compared to metals such as gold and silver. Aluminum is also cheap, but not as strong a conductor. Water, particularly salt or dirty water, is also a great conductor, as is graphite and concrete. The key is in finding materials with unbound electrons called free electrons. Follow the link for a good list of conductors and insulators.
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