You know that cold you just had? You may have taken a day or two off work, but chances are it disappeared in a matter of days. We once lived in a world where illnesses like the common cold, polio, smallpox or tetanus could mean a death sentence. Luckily, medicine has advanced astronomically since that time, and life expectancy has surged on a global scale. Could there be a cure for cancer? Can stem cells end blindness? Here are ten conditions with encouraging remedies.