Among his posts of good meals, get-togethers, his spoiled cat Mozza and a gecko licking his toothbrush, he tweeted warnings. "Pyroclastic material from Mount Karangetang-...can reach 700-1,200 degrees centigrade. Trust me when I say, don't touch it." "Celebrating Eid on Mount Bromo is safe. As long as you are not within 1km of the crater...its charms are waiting for you." Expanding his brief, he urged people to clean their gutters, tweeting a picture of a python being pulled from a drain: "Don't just write 'No snakes'. Snakes can't read."

He also told the young to work hard at school, as he had, getting over his hang-up that he was poor and ugly with diligence and lots of hair oil. For those who wanted them, he tweeted challenging scientific facts: diagrams of volcanoes changing shape before they erupted, and a long thread about volcanic mud. He was not a volcanologist, leaving that job to academic monitors in airless sheds at the foot of uneasy mountains; his training was in hydrology, and he had wasted many years at another agency trying to make rain.

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