Can someone with > 15 karma up-vote a few of the decent questions? Karma needed to bootstrap participation.

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It's not possible to vote for questions or answers without first having 15 karma. However since no question has been up-voted the vast majority of users are unable to participate in voting.

According to the user list there are only 6 people who can currently vote:

http://answers.gazebosim.org/users/

I know the gazebo devs are very busy. If the rest of us can vote we'll be able to help tend to answers.gazeboim.org and relieve the burden a bit.