Ask HN: What's your craziest, far out there idea you have?

So, one project I've been working on in the background for the past few years is a NIAC (NASA innovative advanced concepts program) proposal for using gravitational assists between a pair of planets to harvest energy from planetary motion by transferring momentum from the inner planet to the outer one. The harvested energy could be used to accelerate more mass into the loop and exponentially increase the coupling. In theory, this could move Mars into an Earth-like orbit over the course of a century while harvesting millions of yottajoules of usable energy. I call the proposal "Moving planets for fun and profit".

If you know anyone who is into orbital mechanics, I could use a collaborator. I have to spend most of my time on slightly less far-out projects.

Tagging everything in a city so people can create an resource issue for a city counsel and track how long it takes for a city to fix it.

A business debt reconciliation service. Company A owes B owes C owes A. So the software would simultaneously issue credit notes to each. It would have to linked up to a widely used book keeping software though.

Trade box. for craigslist where you could trade tickets, other things. but it takes a picture inside the box and you use an app to unlock it.

A service I pay for which restricts the amount of time I can browse the internet or go on my phone. I'd have to trust it quite a lot but they'd have the ability to restrict my bandwidth and remotely mess with my devices.

There would be a monthly review where we decide how much time is reasonable to spend on each device or website.

Time trader. you trade time with others. eventually skill levels, geography, task types with project plans would be added.

Project tipper but you pledge time, hosting, resources. more for community based projects.

something that logs into email, facebook, banks and downloads the data to database so I can manage the data locally.

MLM but for junk in your closest.

world peace