Koschei’s needle

Immortality is also impossible for about the same reason that forbids perpetual motion. Koschel hid his soul in a needle, hid the needle in an egg, hid the egg in a duck, hid the duck in a hare, hid the hare in an iron chest, and buried the chest under an oak tree on a remote island. His paranoidal contortions left him without an accessible soul. Tales show his malevolence. Maybe that’s what you get from trying to violate nature.