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...works similarly to traditional 2D printing. Material is added drop by drop rather than layer by layer, by controlling the flow of material using piezoelectric flow restrictors similar to those used in standard desktop inkjet printers. As drops are deposited on top of previous drops, three-dimensional structures can be formed. [Images to demonstrate '3D printing' - see...

...Hooke's theory of arches, and explains that the forces at work witin an arch are the same as those in domes. Flying Butresses at Chartres The butresses at Chartres Cathedral are examined. Mathematic models describe how and why the top tier of butresses was added. Beauvais Cathedral A look at what happens when the forces in stone structures are not kept in equilibrium....

...of Fira. Explaining the 'air fall deposit'. Patterns in volcanic eruptions Richard Thorpe and Steve Blake travel to the Kameni Islands to look at craters from volcanic eruptions. How a lack of pattern makes predictions impossible. . The Crystal Fractionation experiment Simulating a magma chamber in a laboratory to show how the process of Crystal Fractionation works....