We know our rockets from head to toe 
, but can you tell the difference between the"Cryogenic Upper Stage, the Solid Rocket Booster and the Cryogenic Main Stage ? #ArianeFacts #TuesdayTopicpic.twitter.com/wk5Ts7R45N
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
The A64 will probably confuse me a little bit, but hey, let's not sweat the small stuff here! ^^
We’ll come back to the A64 in due time.
In the meantime, don’t hesitate to tell us what body part you would compare each Ariane 5 propulsion stage to! We’d love to know, Ute. 
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.