This page collects ideas that, at least in the preset, reside either in the realm of science fiction, or the realm of "economically infeasible". Many of these ideas require tweaking, or are just plain wrong; I'm not a expert, I'm doing this just for fun.
Space Warp Travel
While travelling at a speed near to or in excess of the speed of light is fairly impractical, the notion of teleportation across space, involving an immediate transfer of matter, seems more tangible. I suspect that quantum entanglement would only allow us to capture, and thereby, clone matter, not transfer it.
Faster Than Light Communication
Thanks to the principle of quantum entanglement, it is possible for two entangled particles to share spin's over long distances. If a relay could be established to reach Mars, this would triumph over conventional digital over radio communication.
Nano-robotics
Detoxification
It would be great to have nanobots that could work to remove microplastics and other matter accumulating in our bodies.
Biology
Organisms for Digesting Plastic and "Forever Chemicals"
In certain landfills, in Japan for example, there are specifically bred organisms that can already break down plastics. At the moment, the digesters require warm conditions. Breaking down forever chemicals, however, is likely going to be more difficult. Compounds containing polyfluoroalkyl substances, or PFAS, have no similar analogues in nature.