U.S. Air Force photo by Airman 1st Class Benjamin N. Valmoja
As man pushes further into the dark recesses of space, the margin of error decreases and the most unlikely things begin to pose a greater threat, like poop. Yes, in the vacuum of space even poop can kill you.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.