Do a scientific experiment comparing different ways of making compost: e.g. under water vs air, with all 'greens' together vs with 'greens' and 'browns' in layers, in sun vs shade, with added worms vs without, adding effective micro-organisms, small vs large container, hot composting, wormery etc. Survey experiment weekly for 2+ months. Compare smell, colour, flies, decomposition rate etc.

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