How do you know...

if you run a search before you start a discussion it will give you a list of all topics giving similar discussions to the one you are thinking of launching, blessed be

Try running a search for the topic. There's a searchbar near the top of the page, and you can select mylot there if you want to search the site. If you do find topics that are similar to what you want to discuss, consider taking a different approach to it than they did. If you look at it from a fresh perspective, it'll be interesting whether it's been discussed before or not. And if you find something really old, it might still be worthwhile to discuss the topic anyway, because there are always new people on the site. Just don't copy someone else's discussion, because that's cheating! I hope you have fun and make lots of friends here. Good luck! =)