61.   But most orchids, from tropical and subtropical areas, are epiphytic, clinging to trees or rocks and drawing nutrients from thin air.

62.   But over the last five years, as preferred varieties in the Pacific became scarce, a new market has appeared out of thin air.

63.   But the missile missed, because neither the MIG nor its missile could maneuver effectively in the thin air of extreme altitude.

64.   But the newly discovered loans did not materialize out of thin air.

65.   But the pressure of work and thin air takes its toll.

66.   But then many of the words in this production evaporate in thin air.

67.   But the helicopters, despite the thin air and sloped terrain that makes landing a fine art, continue to bring rations.

68.   But to keep his oxygen consumption minimal, he has prepared himself for the thin air by conditioning his body at home in a special decompression chamber.

69.   But those payroll and Social Security deposits mysteriously vanished into thin air after midnight, creating a customer panic.

70.   Cell phone conversations can be snatched from thin air.