Real life applications of Topology

The other day I and my friend were having an argument. He was saying that there is no real life application of Topology at all whatsoever. I want to disprove him, so posting the question here.

What are the various real life applications of topology?

Answer

See “Topological Insulators”, an invention that takes
electronics to a new phase.

https://en.wikipedia.org/wiki/Topological_insulator

Attribution
Source : Link , Question Author : Bhargav , Answer Author : Martin Sleziak

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