10. Astronauts Can’t Cry in Space
Lack of gravity makes many things a lot more difficult. That’s why astronauts have to train for so long before they ever leave earth.
We all know you have to be tough to make it to the ISS. But did you know that you have to be so tough that you can’t cry even if you wanted to?
Because of the weightless environment, tears can’t roll down your face. They just collect into little balls that sting your eyes.