What did Vikings ever do for us?

What did the Vikings ever do for us? Quite a lot it seems. 

They founded our cities, taught us how to build better ships and left behind beautiful artefacts. Research just published suggests that they also did something for horses.

A noble steed has four main ‘gaits’. It can walk, trot, canter and gallop. When trotting, a front foot and the rear one on the opposite side move together; two feet touch the ground at the same time. Some breeds, however, are capable of a fifth gait known as ‘ambling’, in which the animal moves all four legs independently of each other, one foot at a time making contact with the ground.