Huh. Elon Musk learned to design launch vehicles from a book I helped write: Int'l Ref Guide to Space Launch Systems http://arc.aiaa.org/doi/book/10.2514/4.475917 …https://twitter.com/DanielleFong/status/782984534572670977 …
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more