# List of dreams that have not yet come to pass This is a list of [[Leonardo Ideas]] that are worth paying attention to (and potentially putting more effort into) because they are potentially powerful ideas that need some hard-but-debatably-impossible constraint to be relaxed before they’re successful. Many of these will either be at a peak or trough of a hype cycle depending on when you read this! * [[Solid Oxide Fuel Cells]](via Palmer Luckey) * [[Closed Cycle Steam Engines]] (via Palmer Luckey) * [[Airships]] * [[Two-way hyperlinks]] * [[Vertical Farms]] * [[Solar Powered Air Conditioners]] * [[Suspended Animation]] * [[Automatically generated 3D printers]] * [[Floating Cities]] * [[Fusion reactors]] - both for energy and transport * [[Nuclear powered spacecraft]] * [[Annotating the internet]] * [[Nanobots in people]] * [[Nanobots manufacturing macro things]] * [[Tidal energy]] * [[E-ink book]] * [[Commonplace Supersonic planes]] * [[Mechs and power suits]] * [[General purpose home robots (Rosie the Robot)]] * [[Black box factories]] * [[Asteroid Mining]] * [[Vertical cities]] * [[Speech to code]] * [[Railgun based transport]] * [[Space elevator]] * [[Hovercraft]] * [[Room-temperature superconductors]] * [Tesla Turbines](https://en.wikipedia.org/wiki/Tesla_turbine) <!-- #list --> [Web URL for this note](http://notes.benjaminreinhardt.com/List+of+dreams+that+have+not+yet+come+to+pass) [Comment on this note](http://via.hypothes.is/http://notes.benjaminreinhardt.com/List+of+dreams+that+have+not+yet+come+to+pass)