Cells are good at sensing what's going on in their environment. Now, this sensing is also possible outside of living cells. Scientists developed a sensor, that notices a specific RNA, e.g. from a virus and than changes colour.There could one day be inexpensive, shippable and accurate test kits that use saliva or a drop of blood to identify specific disease or infection — a feat that could be accomplished anywhere in the world, within minutes and without laboratory support, just by using a pocket–sized paper diagnostic tool.
How it actually works