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Topics starting with O

• OCD (1)
  • What is obsessive compulsive disorder?
• Opium (2)
  • What are opiates?
  • What are the dangers of opiates?
• Organs (5)
  • What happens in weeks 13 to 16?
  • What is the future for organ transplants?
  • What is tissue engineering?
  • What is tricky about transplants and transfusions?
  • Where do body parts come from?
• Out-of-Africa (2)
  • How closely are you related to a Neanderthal?
  • One birthplace?