Question: What does double spend mean?
Welcome Joel_Jantsen. Sure,you can ask questions,so long it helps in increasing user's existing knowledge. Feel free to ask some more.
To everyone who has answered in this thread: I haven't updated the answers for a couple of questions,moderation of unwanted messages is still left but give me a couple of days(probably) to sort things out. You shall receive your merit if you answer correctly according to the question and you also follow the rules. Failure to do so,would result you not to receive any merits.