I am like the fish in the aquarium, thinking in a different language, adapting to a life that’s not my natural habitat. I am the people in the other cars, each with his or her own story, but passing too quickly to be noticed or understood.
There are a lot of differing opinions on that. Some people think you should change out more, but I think changing just 20 percent is less stressful on the aquarium and fish. Once you get used to the regimen, it's pretty easy.