Grass

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Almost all of us at some point play on, relax on, plant, tend, or harvest grasses – but how much do we really understand them and how much do they shape human existence? Samira Ahmed is joined by Susanne Lucas, executive director of the World Bamboo Organisation, Dr Umesh Singh a plant pathologist and biotechnologist from the International Rice Research Institute and Dr Stephen Harris a population geneticist and curator of the Oxford University Herbaria. Photo: BBC