Wife and I did Dorf Romantik on a recent long train ride and we had a great time. It’s very cozy/calm which helps when you want to stay low energy and not bother your neighbors. And I fully agree with the battery pack idea - it gives me a ton of peace of mind when I’m traveling.
It’s so tragic that we have no records of Washington, Tesla, da Vinci, Newton, Faraday, or Kant. If only they’d thought to have kids they might have left a mark on the world.