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...Open University's Jennie Lee building strives to answer this question. This video takes a look behind-the-scenes of the project, which involves an artistic installation of grey and orange balloons which have been produced in the building to signify the number of people using the lift or taking the stairs. The grey balloons represent the stairs, and the orange balloons,...

...open end at the bottom. This is lowered into the induction melted metal. Vacuum is applied, and metal is transferred uphill, into the mould. [Diagram of Hitchiner Process ] Chandler-Lamb Vacuum (CLV) – Hitchiner Process Similar to CLA process, except that a double vacuum chamber is used, for which it is difficult to balance the control of pressures. Argon is allowed...

...Open University's Mathematics courses. Periodic tiles Imagine tiling your bathroom with square tiles. Square tiles will fit together perfectly to cover the whole wall. In fact, if you had infinitely many square tiles, you could use them to cover an infinite flat surface. The downside is that the pattern is quite boring. In fact, if you take a copy of the pattern, and...