[203] These were being launched in his 1942 brief story "Runaround", although foreshadowed in some earlier stories. Afterwards, Asimov added the Zeroth Legislation: "A robot may well not harm humanity, or, by inaction, let humanity to return to harm"; the remainder of the laws are modified sequentially to admit this. http://hectorlicul.blogripley.com/12781063/little-known-facts-about-robot-fönsterputsare