Pianos.
There are pianos in Charles de Gaulle airport, Gare du nord, London Pancreas stations and likely numerous other transport hubs. There's nothing more beautiful than listening to someone with skill playing the piano, and having then publicly accessible like this in places where you are trying to get somewhere else is magical. Forgetting for a moment the job if going somewhere and simply enjoying a human pleasure - music.
Eurostar.
There is security on entry to the boarding area that is the equal of airport security. I'm not against it but it's worth noting that if you think the train is quicker your likely wrong. It's more convenient to train into the city rather than have an airport transfer but the mechanism of using it is roughly the same as flying.
London Underground.
It's £4.50 for a single paper ticket. That's much more expensive than the Paris metro. It drops to £2 and change with the Oystercard but trying to work that baby out in a station at peak hour is a challenge.
Paris Metro
There is a "Paris metro" app which is great but why the heck don't they put end points on their routing instructions! To take the metro place to place you need to map out where you are, which lines you will take, and which station they terminate at. Eg. Line 1 towards La Defense or Chateau de Vincennes. Which direction you go depends which side of the platform you stand on. Important to know the direction so you can navigate to where you want to end up.
