Old joke: A reporter once asked the aging Einstein if he though inventing the Cosmological Constant [1] was his biggest mistake. "No" he replied, "that was my

Old joke: A reporter once asked the aging Einstein if he though inventing the Cosmological Constant [1] was his biggest mistake. "No" he replied, "that was my second biggest mistake. The first biggest mistake was marrying my first wife." [1]. https://en.wikipedia.org/wiki/Cosmological_constant https://en.wikipedia.org/wiki/Cosmological_constant