In Switzerland, which like the U.K. isn't part of the euro zone, the central bank has used the euro as its external reference point in its efforts to keep the Swiss franc's value stable.
Adjacent lenses in O. wendtii are generally attached to the same individual plate of the external skeleton, so they all point in more or less the same direction.
And several recent studies point to a range of factors -- from a mother's religiosity, external emotional support and a grandparent living in the home -- that can concretely contribute to single mothers' raising productive, happy children.