101.   Yet despite these advances, researchers still know surprisingly little about how normal eating should be defined, or where its exact boundaries lie.

102.   Yet researchers now know that exercise is good not only for the heart.

103.   Only the rodent researchers knew for sure what they were getting back.

104.   And researchers also know that when these two forms of matter collide, they annihilate each other.

105.   And researchers do not know where the virus resides between outbreaks or how the first victim contracts it.

106.   And the detailed bibliographies accompanying each essay prove these researchers know their stuff.

107.   At the time, not even the researchers knew who had eaten what.

108.   But researchers know that the subtle looks of each mosquito can make the difference between life and death as they track mosquito-borne diseases.

109.   Critics have also said the fact that the list itself is secret makes it impossible for researchers to know if their work delves into classified subjects.

110.   For years, researchers have known that cats, dogs, dust mites and cockroaches can cause allergies that trigger the wheezing and constricted air passages of asthma.