Alan Davies and Marcus Du Sautoy get to grips with the problem of measuring the exact length of a piece of string. They visit the National Physics Laboratory, look at how a metre is defined now, and ...

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Some standard modules for making 3d shapes with attachment support, and function forms that produce a VNF. Also included are shortcuts cylinders in each orientation and extended versions of the ...

Recommended Puzzles Find a place for every digit 1 to 9 in this classic numbers game Sudoku Add, subtract, multiply and divide to find the right number Totalize Connect the words on the ladder, one ...