81.   The researchers did not know which women had had doulas.

82.   The researchers do not know if even more therapy would result in complete use of the arm.

83.   The researchers do not know if the nests were built in hollow trunks or if the bees hollowed out the spaces the nests would occupy.

84.   The researchers do not know what molecule the Stargardt transporter is pumping.

85.   The researchers now knew that there was a new strain of E. coli that could get into food and make people seriously ill.

86.   The researchers do not know why tangeretin suppresses cancer growth in vitro but not in mice.

87.   The researchers do not know why, she said.

88.   The researchers will know what my brain looked like at this age and how my memory exhibited itself.

89.   The researcher knows it and sees it in the statistics.

90.   The researchers do not know why the magnetic field makes the disinfectant more effective.