‘A gift that falls from the sky’: why farmers are using Etna’s ash as fertiliser

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However, Koch never credited the Hesses for their discovery of bacteriological agar, perhaps because, at the time, he failed to recognize its importance. Even after he received the insight about agar from the Hesses, Koch stuck with gelatine for years. In 1883-84, during his first medical expedition to Egypt and India to investigate cholera, he tried and failed to grow the cholera bacterium on gelatine media in the hot climate of Cairo (despite using a half-open fridge for incubation), only succeeding in the colder winter of Calcutta.

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One of the biggest developments in the fire alarm space in recent years has been the rise of smart tech – wi-fi connected alarms that reach you by phone, for example, if they sense smoke while you are out.

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