| 41. | First, it has to be placed near active areas, which can be difficult to locate.
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| 42. | Practical non-Foster networks are an active area of research.
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| 43. | The eastern Sierra has been a seismically active area.
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| 44. | Social trap research continues to be an active area.
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| 45. | The islands are in one of the more seismically active areas of the Southern Hemisphere,
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| 46. | Noncommutative rings serve as an active area of research due to their ubiquity in mathematics.
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| 47. | An example of an active area of research in algebraic number theory is Iwasawa theory.
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| 48. | They said a major earthquake in the seismically active area could lead to a catastrophe.
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| 49. | Abstract regular polytopes remain an active area of research.
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| 50. | The Phoenix area is an active area for counterfeiting, partly because of its proximity to Mexico.
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