This is really well done, nice job. The only conflicting thing I really see with the Half Life Wiki timeline is that Take Your Daughter To Work Day takes place "Several Days Before May 16th, 200-", and I'm not really sure which one is more valid in the date (since that's a significant date for Chell and Aperture). I like how you explained the flooding of the Aperture more, though. Very informative and interesting.