Ask HN: What are your crazy tech ideas?

Mosquito laser hunter

Inside a room: a device identifies a flying insect, tracks its movements and beams a high-powered laser to bring it down.

The benefit is an automated perimeter protection at locations plagued by mosquitoes that bring malaria, health issues and suck the blood out of humans.

There is the risk of inadvertently shooting humans or animals.

A decentralized marketplace that's like Amazon.com but without Amazon. Creating an easy software solution to bring the inventory of every brick and mortar store online for cheap quick delivery or pick up. The ability to track/authorize orders so if someone bought an iPhone and they wanted to resell it, they could relist it on the marketplace as a used item with one click.

Some state of the art trust system between manufacturers, sellers, service providers, and customers. The ability to police counterfeiters and scalpers. Manufacturer says they created 10,000 and they sold to these parties and you can trace the supply chain from manufacturer to customer.

Large scale cheap desalination. I was born in a dry area which had so less water that no crops would grow and the water was rationed. It absolutely sickens me that our "blue" planet has so less drinking water. I am still thinking about solutions but unfortunately that isn't my main focus right now until I can sustain myself.

Some kind of generic IoT sensor that you could attach/integrate with almost any physical object, that could open up that object for digital communication. And the sensor would have no/very long lasting batteries.

I'd like to work on the control system for a travelling wave reactor or the operating system for a space station.

Artificial general intelligence