I think this might be what they are talking about. Brilliant video, the story just builds and builds and builds. https://youtu.be/K4yCXIZ32lk

Are there other gasses that could be used. E.g some of the noble gasses like argon or neon?

Would guess they are trying to puncture whatever keeps the pontoons afloat. I know nothing about the bridge pontoons though, but seen plenty of helicopters with lots of holes in them

I really hope in the next few years we see a revolution in short distance transport. Most journeys are less than 3 miles (if I remember correctly, could be 5) a perfect distance for e-bikes, e-scooters and normal acoustic bikes. Hopefully at least some places capitalise on it

Metals are made of crystals, they usually defourm along the grain boundaries and fatigue cracks also grow along them. By eliminating those boundaries you reduce the chance for fatigue cracks and make the overall blade stronger.

His dad must be very upset that he is making pots and not tools.

Then how do people get to the jobs without any infrastructure

Also lots of other places (YouTube as an example) allow you to migrate your account indefinitely, over a decade after they were purchased.