Yeah, I think the common denominator - and this is probably going to sound like Acting 101 - but the common denominator is belief in the character in the moment.
After leaving law school, I intentionally said that I never wanted to hold a job more than six years.
I did research when I was pregnant with my first daughter and was horrified by the chemicals in products, even those meant for babies. I would have to go to 50 different places just to get my house and my kid clean.