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Jessica Meir, NASA astronaut and comparative physiologist, tweeted a short video on September 9, accompanied by some text saying that she was entering a space equivalent zone for the first time in her career, an atmosphere so inhospitable that water boils spontaneously.

Luckily for scientist Jessica Meir, a random dude—whose bio mentioned "@SpaceCampUSA alum"—was on hand to correct her explanation, tweeting, "Wouldn't say it's spontaneous. The pressure in the room got below the vapor pressure of the water at room temp. Simple thermo."