The body has mechanisms to alter or maintain blood pressure and blood flow. There are sensors that sense blood pressure in the walls of the arteries... My WebMD Sign In, Sign Up
Perhaps while we're not watching, the denizens of Dark Shadows carry-on, caught in another inter-dimensional wing of Collinwood. If you peer out the corner of your eye, you may catch a glimmer of this shadowy activity, perhaps in Dark Shadows Collection 14, or Dark Shadows Collection 22.
Over five thousand years ago, the ancient Egyptians used eye shadow, not only for cosmetic but practical purposes as well. Dark pigment painted around the eye helped protect the eye from the bright midday sun glaring off the desert sands. The earliest eye paint in ancient Egypt was a thick, bright green paste made from the mineral malachite.