kilometre

They can also view the digits on gas pumps from a kilometre away on the other side of a river.

Or you could set up a treadmill, and you get a kilometre of free train transport for every kilometre you walk on the treadmill. Call it performance art.

Do you seriously believe there is any regular reader of Hacker News that doesn't know that a kilometre is less than a mile?

The per-kilometre cost is going to be astronomical. I don't think one of the problems of maglev is stopping distance: that's mostly constrained by how many G's you want to subject your passengers to.

Going to a 4MP camera would be sensible if and only if they could have doubled their wireless bandwidth across a 300 million kilometre gap. Bandwidth is the killer bottleneck on interplanetary missions, not pixels.

It's clearly not litres of diesel per passenger-kilometre." Humanity" is pretty good at economising scarce resources.

Uk/ this project "aims to collect geographically representative photographs and information for every square kilometre of Great Britain and Ireland".

By definition, commodity profession jobs are everywhere, because there are a lot of them, that's what makes them "commodity" - there are cashier jobs within a kilometre of where most of us live, as an example. It's when you start getting specialised that it gets harder to negotiate where you work - there might only be one company doing web-development work in a 10km radius around your home.

Even using electricity generated from coal or oil, high-speed trains are significantly more fuel-efficient per passenger per kilometre traveled than the typical automobile because of economies of scale in generator technology[42] as well as lower air friction at the same speed." Nonetheless, it will also make it easier to reduce emissions as renewable energy output ramps up.