Nanoparticles were chemically produced using the quantum dot technique. And so far they have been used to make computers. Now, researchers have found that you can reproduce them from tea leaves. The method is cheap and has no side effects. Quantum dots are tiny particles whose size is less than ten nanometers. It is worth noting that the thickness of a human hair is 40 thousand nanometers. These particles can be obtained using chemical reactions, but the cost of such production is simply crazy. Yes, and there were a lot of toxic side effects. Now, researchers at Swansea University have found that a similar result can be obtained much cheaper and without toxic consequences. They suggest producing particles from tea leaves. Each leaf contains many different compounds, in particular antioxidants, vitamins, amino acids, polyphenols. Scientists mixed Na2S (sodium sulfide), CdSO4 (cadmium sulfate) and tea leaf extract. The result is quantum dots. The solution with them was applied to cancer cells, which were formed from a malignant tumor located in the lungs. Penetrating into these cells, the quantum dots left about one fifth of the previous volume, everything else was destroyed. CdS quantum dots, which scientists obtained from tea leaf extract, showed unique fluorescence radiation with a biochemical effect on cancer cells. Especially in comparison with CdS nanoparticles, which were obtained chemically. In addition to cancer, the new technology can be used to create sun-protection creams and antimicrobial paint. Next, scientists want to organize their factory and produce these particles on a commercial basis.