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...opened and component removed. [Diagram to demonstrate Melt Casting (see article)] Manufacture: Only requires melt extruder and mould. Screw-type extruder must be capable of delivering homogeneous melt, at sufficient speed, to fill mould cavity before freeze-off. Mould fills under low pressure, so can be soft steel or aluminium. Backing plates on the mould are unnecessary...

...opening in the base of the die. In cold extrusion, metal powder is compressed directly into the die, causing sections of metal to extrude from the small hole in the die base...The cold extrusion of metal powder [Diagram to demonstrate the 'Extrusion of powders' - see article ] The hot extrusion of a "canned" refractory metal powder [Diagram to demonstrate the 'Extrusion...

...Open University professor John Zarnecki - a man who knows a thing or two about space, and has met an astonishing proportion of the people who have been there - for his response. It's fair to say Trevor Beattie might find himself being blasted into orbit slightly sooner than Richard Branson could manage: What arrant (utter, complete) arrogance to suggest that scientists...