Nature Link 

Creating a paper device to improve public health in Nepal 

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After returning to his home country Nepal in early 2014, Giri’s fascination with the potential of tiny devices stayed with him. Giri is a co-founder of the Kathmandu Institute of Applied Sciences (KIAS), and he and his team have designed paper-based devices that use analytical chemistry to test everyday items such as water, drugs and vegetables for contaminants. The paper device changes colour when it is exposed to specific molecules — similar to a litmus pH test. The tool is cost-effective, simple to customize and portable, so it can be readily used and has huge potential in some low-income countries, where many people still get sick from drinking contaminated water, eating food with high levels of pesticide residue or taking counterfeit medicines. 

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