Dear Rob, What is it you don’t know? * Why the sun shines? * Why beer tastes so good on a hot sunny day? * How to choose between Nikki & Kristen (Choose me. Or Ashley)? * How your hair stands up after 5 days of grease? * Why you carry around a briefcase from Staples’ 1992 collection? * Why getting an @ message from a fake rob on twitter is a thrill? * How the heck we ended up in Glamour m…