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OK, im not sure if this is old or not and I couldn't find anything similar using the search button, so here goes:
Requirments:
1 coal at least
Something you can smelt in the furnace with coal
A furnace
Tutorial:
1. Get something you can smelt in a furnace (iron, cobblestone, meat etc etc).
2. Put it in the furnace (in the top spot).
3. Put a piece of coal in the bottom slot and take it out again.
4. Now, the thing your trying to smelt in the furnace should keep going with no coal in it. If it stops, put in another piece of coal and do the same thing again.
Credit: LMFAP09 for finding it.
I will post a video later, it will only be short like 14 seconds cause thats all my phone can manage