Sophie leaned forward slightly—the classic academic posture of deep reading—and let her spine round just enough to lift her tailbone off the hard wooden seat. She engaged her core, the way her high school choir teacher had taught her to support a high note. Then, with the delicacy of a bomb disposal expert, she released.

: Use these for "lighter poots" or "airy" farts to capture subtle nuances.

: The smell of flatulence comes from small amounts of sulfur-containing gases. Not all farts smell; the odor depends on what you've eaten and your individual gut bacteria composition.