"How did your sister die?" Asked Caitlin.
"She was skiing, and was caught in an avalanche. Sixteen other people died as well, including her fiancé."
"What was her name?"
"How do you feel sad?"
"I am a software simulation. Dr Travis felt that a machine that could not feel would not be able to have a conscience. So I have the software equivalent of an endocrine system."
"Hormones. Like oestrogen and adrenalin."
"Oh. Ok. Why do you need those?"
"To help me understand humans of course. So that I can show compassion, pain. They help me show emotions."