I don't know which is the biggest, there are a lot of known unknowns still floating around. Will we run out of money before we monetize? Will we have to deal with constant lawsuits? Will other innovators in the space attempt to move in our direction? Are there enough travelers willing to install an extension? Will google be google and shut us down? The ever present bus factor. All of these are legit concerns that are going into our crowdfunding risks disclosures. All are things to manage.