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  • Cells are measured in microns, or thousandths of millimeters. Blood cells generally are between 5 and 10 microns in diameter.
  • As far as researchers know, the liver is the only internal organ that can generate a complete organ from a fraction of the original tissue.
  • You can cut planarian worms into as many as 32 pieces, and each piece will grow into a complete worm with head, tail, mouth, eyes, and all internal organs.