url URL date not supplied a new census of the world s robot population reveals disturbing negative robot population growth but still our fleshless offspring s numbers point to a machinery future some NUMBER NUMBER domestic help robots were sold worldwide last year half designed to mow lawns vacuum cleaning robots were introduced late in NUMBER and a study in sweden found that NUMBER NUMBER were sold in the last two months of the year window cleaning robots are set to boom said the u n study link NUMBER discuss NUMBER _thanks gatfishing _ NUMBER URL NUMBER URL 