(r) Viscosity.

3.10.1.6.3 The classification criteria refer to kinematic viscosity.

When the Prestige sank off the coast of Spain, there were big, floating cushions the size of sofa cushions of emulsified oil, with the consistency, or the viscosity, of chewing gum.

It didn't come from there. The mountain bike came from users, came from young users, particularly a group in Northern California, who were frustrated with traditional racing bikes, which were those sort of bikes that Eddy Merckx rode, or your big brother, and they're very glamorous.

Now, Van Gogh doesn't know anything about physics, but I think it's very interesting that there was some work done to show that this eddy pattern in this painting followed a statistical model of turbulence, which brings up the whole interesting idea of maybe some of this mathematical patterns is in our own head.