4 years ago, @ArmanHezarkhani and I had a conversation about creating the Presidential Brief for everyone on earth. The Presidential Brief is a daily summary of high-level, all-source information and analysis on national security issues produced for the president. What would that look like but for you? A 1-of-1 newsletter for every person on earth. The concept has always been appealing, but pre-AI it wasn't feasible to create killer customized daily newsletters for anyone. Now it's not…