What are some other interesting uses of sodium fluoride, besides our drinking water?

Sodium fluoride is a very toxic waste product from aluminum and fertilizer production. Before water fluoridation of domesticated humans became popularized, manufacturers had a very difficult time of disposing this dangerous material. What are some other interesting uses of this highly toxic industrial waste... show more Sodium fluoride is a very toxic waste product from aluminum and fertilizer production. Before water fluoridation of domesticated humans became popularized, manufacturers had a very difficult time of disposing this dangerous material.

What are some other interesting uses of this highly toxic industrial waste by-product, from mind-altering drugs to rat poison?
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