Astronauts can cry in space, but their tears never roll down their cheeks. In weightlessness there’s no “down,” so surface tension keeps the water clinging to the eye, where it swells into a wobbling ball. Keep crying and the ball can creep across the nose into the other eye. The easiest fix? A towel. (Canadian Space Agency astronaut Chris Hadfield demonstrated this on the International Space Station with drinking water.)
Footage: NASA (public domain). Not affiliated with or endorsed by NASA.
Video: NASA ISS footage via images.nasa.gov (Moving Water in Space; How Does NASA Study Vision and Cognitive Changes in Space?; Step Inside the International Space Station; Space Station Images Trace Bird Migrations).
Music: “Deep Space Array” by Tozan, CC0 1.0 (public domain):
Narration: AI voice
Sources: Canadian Space Agency, “Tears in space (don’t fall)”; NASA, “STEMonstrations: Surface Tension”; NASA, “What Is Microgravity?”
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