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According to NASA, there are many uses of ISS which benefits us. Some of them are explained below.
1. Supporting water-purification efforts:
Water-scarce places can benefit from improved water filtration and purification systems that are developed for the ISS. A village in Iraq was saved from being abandoned due to clean water scarcity with the help of ISS's Water Recovery System (WRS) and Oxygen Generating System (OGS).
 
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Water Recovery System in ISS
2. Eye-tracking technology:
The Eye Tracking Device, originally designed for a microgravity experiment, has proven to be used in numerous laser surgeries. Additionally, eye-tracking technology helps impaired people who have limited mobility and communication. For example, a child with significant physical disabilities can use their eye movements to complete routine tasks and live independently.
 
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Eye-tracking device
3. Robotic arms and surgeries:
Robotic arms created for research on the International Space Station are assisting surgeons in removing inoperable tumours (e.g., brain tumours) and taking precise biopsy samples.
 
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A robotic arm
 
The inventors of the robots claim that the robotic arms can take biopsies with consistency and exceptional precision.
 
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Robotic arm performing surgery
 
Apart from the applications listed above, there are numerous other ways in which the ISS's research is beneficial. Some of them are:
  • Improved vaccines
  • Detection of breast cancer and its treatment
  • Ultrasound machines for rural areas
Reference:
https://upload.wikimedia.org/wikipedia/commons/d/d6/Looming_robot_arm.jpg
https://upload.wikimedia.org/wikipedia/commons/4/47/External-aspect-of-the-operative-field-DaVinci-robotic-system-docked-to-the-patient.jpg