Space elevators
Who doesn't love the concept of a space elevator?!
Simple and cheap access to space - and eco-friendly.
Once built its self-sustaining. Once the investment is made, everything else is free!
Interest in space elevators is growing - see my recent post:
See also, the website of the International Space Elevator Consortium:
... and all this information on space elevators held in the library of the National Space Society:
.. and this recent YouTube video from Real Engineering that gives a rapid maths and engineering tour de force on tensile strengths, and gravity, and centrifugal force - mind-blowing:
As described in the video, there are a whole host of engineering and practical challenges associated with the concept of space elevators - but just think of the opportunities!
Maybe the Fountains of Paradise are closer than we think?