41.   Doctors have known this for more than a decade, and commonly prescribe anti-inflammatory steroids to help prevent asthma attacks.

42.   Doctors have long known that people sometimes recover from severe hypothermia.

43.   Doctors have long known that the air forced in by ventilators can cause harm to lungs.

44.   Doctors know that infections beyond the placenta play a role in preterm labor.

45.   Doctors know the problem formally as deep vein thrombosis, but some of them call it economy class syndrome.

46.   Doctors never knew what it was.

47.   Doctors will know in three to four weeks if the transplant has taken hold.

48.   Doctors did know one thing, or thought they knew -- his golf game never would be the same.

49.   Doctors have known for decades that fiber is the foundation of any healthy diet, and can help reduce the risk of cancer, heart disease and diabetes.

50.   Doctors know it.