81.   Scientists use a measure called Body Mass Index to determine if an adult is overweight or obese.

82.   Scientists use that cut-off line because it has worked pretty well.

83.   Scientists will then use supercomputers and their own brains to pin down the function of all the genes they have decoded.

84.   Scientists are using a wide range of computer simulations to try to predict what could occur.

85.   Scientists can use newer techniques to make mutations in viruses in the laboratory to study the effects of different genes in new ways.

86.   Scientists have been using both tests in many research studies, and many doctors now use them in prescribing drugs for some patients.

87.   Scientists have used chemical tracers to track and identify pollutants drifting hundreds of miles from cities and power plants to the Canyon.

88.   Scientists use several ways to estimate the frequency of earthquakes on a given fault.

89.   Scientists will use gene studies to determine how closely this lava heron is related to the striated or green herons of the islands.

90.   Scientists can use these so-called lesions to locate many behaviors, feelings, sensations and mood centers.