31.   By taking readings from pulses fired at slightly different angles, scientists can also use the backscattered signals to calculate the direction of the winds.

32.   Currently, scientists must use a microscope to make each pill in order to see its tiny circuitry.

33.   Dr. Steele, who analyzed the meteorite using sophisticated microscopy techniques, said the microbe was overlooked in the past because scientists had been using inappropriate detection methods.

34.   Duke University scientists have used a variant of the technique to transplant thymuses to five adults with AIDS.

35.   Earlier, other scientists had used DNA to solve simpler versions of the problem with at most nine party guests.

36.   For centuries, scientists have used executed criminals for study, the dissection considered further punishment beyond death.

37.   For decades, scientists have used it to make transgenic flies by replacing the transposase gene with the genes they want to transfer.

38.   For example, scientists have used genes to build a biological toggle switch, which corresponds to a fundamental element in computers, and a rudimentary clock.

39.   For example, scientists used to think that tornado winds dropped rapidly away from the funnel.

40.   For him and other climate dissenters, this disparity is key, in that it does not show up in computer models scientists use to predict future trends.