Useful Hints

Had I been present at the Creation, I would have given some useful hints for the better ordering of the universe.

-- Alfonso X (1221 - 1284), Spanish monarch who ruled as the King of Galicia, Castile and León from 1252 until his death, after studying Ptolemy's treatise on astronomy; reported in Thomas Carlyle, History of Frederick the Great, book ii. chap. vii