How Do They Do It? - S7E13 - Car Batteries; Chocolate; Toothbrushes

  • Documentary, Science, Educational
  • TV-PG
  • 21 min
  • Aug 20, 2010
  • HD
Converting sulphuric acid and lead into 100 million car batteries; turning cacao beans into bars of chocolate; how toothbrushes clean our teeth.
Cast: