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...become grey after anodising, due to the high silicon content. Other materials which can be anodised include magnesium and titanium alloys. Design: Designing for anodising depends on knowledge of the effects of the method of manufacture, and surface pre-treatment before final anodising. Castings can reveal pronounced and sometimes unsightly grain structures, while forgings...

...become infected by viruses or by the few types of bacteria and protists that can ‘hide’ inside the cells of their host (Mycobacterium tuberculosis, the bacteria that cause TB, can do this). Without the cytotoxic T cells, we would be particularly susceptible to infectious diseases caused by these pathogens. The other T cell type is called the helper T cells. They send...

...become a store room. Dallas Campbell: So where would you actually, where would you actually …? Frank Drake: When we were observing we had a counter here, and in fact here’s the original equipment here which was used to control the telescope. This is, goes back to 1958. So that’s 50 years old and probably still works. Dallas Campbell: Shall we turn it on? Frank...