1, scientists discovered as early as 1930s that people with finger nerve problems would not wrinkle their fingers. Later, some people have done experiments-cutting off the nerves of fingers will not wrinkle them.

Our hands and feet are wrinkled by water. What really brings trouble to our hands and feet is our subcutaneous nerve.

3. The nervous system is different from other systems. It is willful and tense, which is beyond our active control. Like our breathing, heartbeat and sweating, these systems are self-contained

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