Let me guess, the connectors become even smaller and the cables become thicker and even more rigid. I already fear breaking off the mini HDMI connectors of my Raspberry Pi 4 every time I plug in a cable...

I know the purpose of PDF. But I still think there should be a way to create something like a PDF/A that is both an endless document and one with pages. The headers and footers could be hidden for display on a screen.

"Endless PDF" as in endless paper would be really good. There is no need for pages if the document stays electronic. See web pages. If somebody would print an endless PDF, pages and headers/footers could be added automatically...

Back in highschool I discovered the website http://www.smartfish.ch/ where a swiss mechanical engineer presented his development of an energy efficient plane design. He showed RC model tests, CFD simulation results and wind tunnel testing. Read the news section, where most of the information is located. Sadly, it does not seem that his design ever made it into a larger scale prototype...

Berlin is a bad example for this because public transport was already great there before this ticket. The 9â ticket just made it a lot cheaper. Many people living there do not have a car because they do not need one. The main benefit is people using public transport instead of cars. And that happened quite often.

It is fuelled by hydrogen. Let us hope that the average CO2 emissions of creating hydrogen are way smaller than the amount of CO2 that this device extracts from air. Only in this case it would be feasible to use this technology on large scales.