My house fly theory is related to my theory about why time seems to go faster as you get older."

"Why's that?" the girl asked.

"It's proportional," Leonard explained. "When you're five, you've only been alive a couple thousand days. But by the time you're fifty, you've lived around twenty thousand days. So a day when you're five seems longer because it's a greater percentage of the whole.

Auteur: Jeffrey Eugenides