This is why X-rays can penetrate your skin and soft tissue -- though not bone -- while sunlight mostly reflects off your skin.

CNN: Why gamma-ray burst shocked scientists

During photosynthesis -- the process when the plant absorbs carbon dioxide and gives off oxygen -- organic tissue absorbs airborne toxins.

CNN: Office foliage for feel good factor

After the Botox wore off, one group had a face-lifting surgery combined with the removal of muscle tissue or nerves in the area that triggered the migraines.

CNN: Facial surgery may offer migraine cure

When they carried out a post-mortem on the patient who died, they found some of the brain tissue that had been dying off through Alzheimer's had started to rejuvenate.

BBC: NEWS | Health | Alzheimer's gene therapy hailed