Columbia Accident Report: Read an overview of the investigation on Columbia mission accident, according to which the cause of the shuttle's collapse during descent roots to malfunction of the rocket system during launch and ascent.
Check out this Cartoon on how your thyroid works. Thyroid issues can get complicated, so this might help explain a little bit better what dotors do not explain to their patients. Check out that T-shirt here:
Human Body Ingredients via imaginaryfoundation: 'The average human has approximately 100 trillion cells and each cell is made of approximately 100 trillion atoms, each of which were originally created in the center of a star.