The prices in each shop (and for each frame) were selected at random from between 60 and 120.

ECONOMIST: Economics focus

Of course, the big boys like Trek and Giant can't be faulted here, the nature of mass production makes it impossible for them to finely tune a frame for each individual.

ENGADGET: Engineering a better bicycle with DBC City Bike Design Alt

The spinning wheel is synchronised with the projector to allow alternate images to be sent to each eye six times for every frame of film.

ECONOMIST: Animation takes on a whole new reality

Instead of laboriously comparing each incoming video frame with each stored target image, they could then search for all the targets at once.

ECONOMIST: Optical recognition

Each rover was only supposed to operate for 90 days, but both far exceeded that time frame.

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He starts by building and painting the all-important frame, whose geometry determines that the seat, handlebars and pedals are in the correct position for each cyclist and the sort of riding they do.

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