31.   The key question is whether the low level of microwave radiation used by a cell phone also can cause harm.

32.   The problem with positing dangers from the phones, scientists say, is that the microwave radiation emitted by them is too weak to break bonds in molecules.

33.   The reason, said company officials, is concern that younger people, whose bodies are still developing, may be more susceptible to damage from microwave radiation.

34.   The satellites carried instruments that measure the intensity of microwave radiation emitted by oxygen.

35.   The term refers to tiny but distinct differences in the temperature of the microwave radiation at various points in the sky.

36.   Their findings led to the development of the maser, a device that emits microwave radiation of a single wavelength.

37.   Current exposure limits for cell phones assume that the microwave radiation they emit has no harmful effects if it does not cause heating.

38.   In addition to concerns about scenery and property values, some residents worry about potential health hazards from the microwave radiation transmitted by towers.

39.   In the study, the researchers continuously exposed nematodes, or microscopic soil worms, to levels of microwave radiation overnight.

40.   The glow, called cosmic microwave background radiation, carried an imprint of large waves to the detectors on Earth.