The shells of the bivalve mollusc Gryphaea are known as devil's toenails, and it is the toenails that are meant; in antiquity these valves were a common amulet and were used as a remedy for the joints
At the close of the Strugatskys' "Roadside Picnic" the Golden Sphere is asked for this: "Happiness for everybody, free, and let nobody go away unsatisfied!" I do not promise to leave no one aggrieved, but the digest really does come free. So, here is the
Frederic Leighton. “Daedalus and Icarus”, 1869 Daedalus warns his son not to climb too high: the heat of the sun may melt the wax, but Icarus is already gazing into the distance, and the lamentations of a foolish old man interest him not in the least