@StephenXie This is only a "limited Private Beta" with a lifetime of 7-14 days. Any time after 8 to 15 days, we can be closed if there is not enough activity. We need to get MORE USERS and MORE QUESTIONS. So please, if you do hope that this site takes off, we need your help to email everyone you know to join and ask 1 or 2 questions. Even friends of your that are not in Materials Modeling but are familiar with StackOverflow because they are programmers: they can help with voting/moderating.