This may be possible with some styles of personal organiser already but I haven't come across it. Towards the end of the year I find myself carrying around two diaries as I book appointments ahead. There is also a major task filling in those important dates, such as birthdays. If only we could buy a month at a time so we could "top up" as we go - in effect, a rolling diary.

Elevators (lifts in England) are expensive to install and require top room for the lifting gear. Would it not be possible to build elevators on Archimedes Screw principles - a rotating shaft moving small, single person platforms? No cables or wires to break. Can be used for two storey building.