Firewalking works due to low thermal conductivity of coal
Strolling barefoot across red-hot coals is a staple of mind-over-matter gurus. However, wood ash is a remarkably terrible conductor of heat, meaning as long as you walk briskly and don't stop to admire the view, your feet won't absorb enough energy to burn.

This article describes beliefs and cultural traditions, which are not necessarily scientifically established facts.
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