Myth: A severed earthworm will regenerate into two earthworms
Reality: Planarian flatworms, when severed, can regenerate into two or more new worms, but earthworms cannot. Earthworms have a distinct head and tail, and while the head portion can regenerate a new tail, the tail cannot regenerate a new head.
Source: https://thebestschools.org/magazine/25-popular-science-myths-debunked/