Guitars have also proven that the String Theory is correct. When Eric Clapton or BB King plays they go to another dimension -- all due to the results from their 'string vibrations' :-)
An aside: I've never tried Ernie Ball Slinkys. For about 25 years now I've been using nothing but D'Addario strings. When it's time to change the factory strings on my guitars, D'Addarios go on.