Sick an be one of a synonym
Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. It starts in the esophagus where strong wave-like motions of the smooth muscle move balls of swallowed food to the stomach.
It really depends on the movie. For instance, in Apollo 13, scenes were shoot aboard a Boeing KC-135 or the Vomit Comet. It is a NASA's refueling tanker plane for Zero G training. Astronauts wanna-be would fly up in the plane and experience a free fall.
In the poem "Homework," Allen Ginsberg most likely uses free verse to "share his desire to restore the world to its pristine condition, using an unstructured format." He wants to show that his poems can be written freely without any other structure that should be followed. A structured-poem prohibits nor forced you to follow something that is not at your interest. You can freely expressed well what your poem is about to say.
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