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Ferrofluids
The ability to become solid or liquid with the application of a magnetic field also makes them perfect for computer assisted shock absorbers in Ferraris; NASA uses them for high-tech flight altitude assistance, and like a gyroscope in spacecraft. The Air Force uses their magnetic field absorbing properties to make aircraft invisible to radar and we like to think someday they’ll be able to make super hot, futuristic robot dominatrices that we can store in a cup in the pantry when not in use.
cracked.com