Ticketmaster is doing their very best to make paper tickets unusable with refreshing barcodes. Funny thing is that “anti-theft” feature is needed because of their own systemic failures. I do like tickets that are just sent to my email or similar (e.g. as an attachment that I can save to my phone) though, it’s better than wasting paper when I know my phone won’t fail me.

I do almost the same thing as a(n unpaid) hobby that I do as my (paid) job. I’m a software developer who writes open-source software on the side.

I’ve also seen a few of my other hobbies grow into serious industries with real employees. The (hobby) drone industry and the 3D printing industry are quite large and growing (I assume).

If you thought about the planet you wouldn’t be using smart devices at all, especially not completely unnecessary ones.

Relativity would prevent this. If the train moves at the speed of light, then nothing inside it will move because time will stop. The amount of trains inside trains doesn’t really change much except the effect of time dilation (slowdown) on each train. You can’t actually accelerate to the speed of light.