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From Popular Science:
We're weightless, about 34,000 feet above the Gulf of Mexico, trying not to vomit from motion sickness while wiggling an ultrasound probe into the esophagus of a $26,000 mannequin. In a moment, the hollowed-out Boeing 727 will reach the top of its parabola and plunge 10,000 feet, nose down-there's just enough time before the dive for the three college students conducting this microgravity experiment to snap a few grainy ultrasound images of the mannequin's lifeless heart.
Behind us, a black backpack drifts toward the ceiling. The airplane's seat belts bob up and down, up and down, as though they were underwater. A NASA photographer lets go of his camera, and it hovers in front of his face.
I'm floating a couple of inches above the floor in a seated position (and feeling very much like a genie) when a crew member shouts over the engine noise that we're about to go from weightlessness to two times the force of gravity. The warning is crucial, because you don't want to be upside down when gravity kicks back in. This is also the part of a parabolic flight when most people barf.
Read the whole article
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