Napier's bones are an abacus invented by John Napier for calculation of products and quotients of numbers. Also called Rabdologia. Napier published his invention of the rods in a work printed in Edinburgh at the end of 1617 also entitle...

A 19th-century literary masterpiece, tremendously influential in the arts and in philosophy, uses the Persian religious leader Zarathustra to voice the author’s views, including the introduction of the controversial doctrine of the Übermens...