1. A Chinese chef was killed after a cobra head that had been cut off for 20 minutes bit his finger, showing that severed snake heads can still bite due to reflexive nerve responses. 2. While snake heads may seem harmless after being cut off, scientists explain that snakes have an underdeveloped nervous system where reflexes can continue even after death from nerves in the body rather than just the brain. 3. Even dead snakes should not be touched as their venom can remain toxic for a long time, and fangs may contain bacteria that could cause infection if they scratch the skin.