A Horrifying Thing Happens to Your Fingernails After a Walk in Space

I guess it's because of the radiation (I didn't read the article of course)
Oops, nope :

"When the gloves are pressurized, they restrict movement and create pressure points during tasks, sometimes resulting in pain, muscle fatigue, abrasions, and occasionally more severe injuries such as onycholysis. Glove injuries, both anecdotal and recorded, have been reported during EVA training and flight persistently through NASA's history regardless of mission or glove model."

Nope. You're not going to get me to click to read about some gross fingernail thing.