Neofriends.NET Second Birthday Quiz So we are celebrating the second birthday of this awesome site... but the presents are for you! You can win great prizes by answering the questions in this contest! Rules: People can answer no more than 5 questions each. You can only guess once every 5 minutes. Multiple answers are not allowed First question will come in a couple minutes...

Let's start with a logic question! Question #1 There exists an unusual tree. It doubles in height annually, until it reaches its maximum at its age of 21 years. How many years will it take until it reaches half its total height?