31.   The group advanced standards for transmitting Internet traffic over cable systems and wireless networks, and on other issues so technical that only computer scientists could understand them.

32.   The phenomenon is poorly understood by scientists.

33.   What the scientists did not understand was why vegetable fats seemed to lower cholesterol levels.

34.   Other factors not fully understood by scientists cause people to react to food, such as repeated exposure to it.

35.   For decades, scientists did not understand much about leprosy.

36.   There are questions about the value of testing for certain genes until scientists better understand how they work.

37.   Friedman said other genes related to weight control must also be identified before scientists thoroughly understand how the body controls its weight.