CNN
Last month marked 20 years of continuous human presence on the International Space Station (ISS). Scientific research to improve life aboard the ISS has led to countless developments in space technology, but it has also brought benefits to people on Earth.
LED lighting technology developed to help astronauts avoid sleep deprivation has been adapted for domestic use; a weight-lifting system to keep astronauts fit in zero gravity is being used in home workouts.
Now a company that designed a water-purification system for the ISS is developing spin-off technologies with the potential to provide clean drinking water in the places that need it most.
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