By Maggie Shiels
Technology Reporter, BBC News, Silicon Valley
"I really like people and I really like sick people," said Ms Wojcicki.
"It's a really acute moment in someone's life and you want to help them. I have always been interested in health care and doing something that is dramatic."
Ms Avey is similarly motivated and was inspired to do good by her parents.
"I grew up in South Dakota where my dad was a Lutheran minister and my mom was a nurse," she said.