Don't know your pre-money from your post-money or carried interest from convertibles? Now there's a 99-cent iPhone app for startup founders to bone up on investing terms and concepts they might encounter when they first try to raise money.. It is called Angel Trivia Daily , and it tests your angel investing knowledge witha new question every day. Created by two Seattle entrepreneurs, Joe Wallin and Bill Carleton, it's a fun way to learn the minutia of angel investing.