I have wanted to mention for some time that the very notion of String Theory goes back to Descartes. For at first because of the linear relationships found in the 1950's and 1960's between Angular momentum and the Energy squared that you could have a model of two quarks going around each other. But that left some daughter trajectories unexplained. So the idea was to concern the two quarks joined by a wire or string that explained the full relationship. But that string is in a slightly different from the exact same thing that was proposed by Descartes with his vortexes. [The difference is that two quarks going around in their force field leads to one kind of relationship that is different than if they would be attached by a strong string. The tension on the string is thought to be a constant of nature.]
