You got it. Human environments are filled with dust, salt, and oils. When I was trying to finish my Ph.D. -- which required me to build some semiconductor lase

You got it. Human environments are filled with dust, salt, and oils. When I was trying to finish my Ph.D. -- which required me to build some semiconductor lasers that were reliable enough to be tested more than once -- I eventually reached a mental state where I was so focused on cleanliness that I felt vaguely uncomfortable touching anything, including objects in my own home, without wearing gloves. I'm much better now.