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Mango's going solo this week, as Barrett is out of town and out of country! After he's caught you all up on his riveting week, Dr Mango gets into reading some of his wonderful book 'How to Be Your Best (Brain).' Then we have another A-Z of Brains, this week looking at Hormones, a very versatile chemical group. Reviews of our show are then shown off, and John finishes this week's episode by sharing some of his favourite brains from history. Barrett will return, in Episode 69!