Forget about the ad you placed in the personal column for the double-jointed twins. Let’s take a look at your own for the moment.

Maybe we find the colour red so vibrant and dramatic because it’s the colour of life itself: the bloodstream, flowing throughout the body and nourishing its billions of cells.

Veins don’t get quite as much press as arteries, but they’re still important, forming the ‘other half’ of the intricate system of blood vessels.