You may be familiar with Scrat, the “saber- toothed squirrel” from the Ice Age movies, but a real o...

Scientists from the the Tokyo University of Scienc...  ...ty of Science used mouse stem cells to grow a new tooth that worked like a charm in a mouse's mouth. The...  .... The cells were grown in a lab dish until a tiny tooth "bud" formed. It was then transferred to the jaw...  ...as then transferred to the jaw...