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Japanese fish scientists get salmon to spawn trout – the first time one species has given birth to another and a development which could have a big impact fish farming. Could giant African rats do the same job as a sniffer dog? How wild forest bees are coffee-growers best friends. An exhibition devoted to excrement – including 100-year-old penguin poo – and its scientific value at the Walter Rothschild Museum in Tring, UK.