President Barack Obama joined the question-and-answer site Quora today to answer questions about the Affordable Care Act, part of a broader push to reach young people and encourage them to sign up for insurance at Healthcare.gov. In two answers posted to the site, Obama promoted improvements to the enrollment process and explained some of the benefits of healthcare reform. For young people, health insurance is about peace of mind, the president wrote. Joining Quora is part of a last-minute push the White House is making to encourage young people to sign up for insurance before the March 31st enrollment deadline.