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Plain old corundum - you can get pieces of it the size of your fist if you see what is left after welding railroad tracks with termite.

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"... welding railroad tracks with _termite_."

Sheesh! With the above post the state of spelling on the Internet reaches a new low.

They dropped a single letter, and it resulted in something that was still a word. What internet have you been dealing with?

If anyone else was wondering, it was supposed to read ‘thermite’. (I had to DDG it, and then still, I had never heard of the stuff.)

http://en.wikipedia.org/wiki/Thermite

Thermite is amazing stuff. There's some thought that part of the reason the Hindenburg burned so much so fast was a thermite reaction in the stuff it was painted with:

http://dsc.discovery.com/tv-shows/mythbusters/videos/hindenb...

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