During stasis, platelets and other clotting factors contact the endothelium, and prolonged interaction leads to clotting factor adhesion, and, ultimately, activation of the clotting cascade.
Colors are generated when wavelengths of light interact with objects, and most of the colors you've seen outside a screen were produced in one of two ways.
He spent most of his time at Caltech the idea of quantum physics, where all these particles are interacting in mysterious ways, he came up with a thing called Feynman diagrams that he won the Nobel Prize for.