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The London firm that made the pair of brass bells set up by an Oxford clergyman in 1840 wrote that the batteries behind them would normally last only three or four years. The clapper, 4 millimeters across, is still crossing between the two bells twice a second, and nobody has opened the batteries to see exactly what is inside.

In Stockholm, the heat pouring off the city's data centres is no longer wasted but piped into the district heating network, enough to warm around 30,000 apartments a year, which means the warmth thrown off by people streaming films and storing photos now quietly heats thousands of homes across the city.

Olympus Mons grew so massive that parts of its lower flanks catastrophically collapsed, sending broken rock sliding hundreds of kilometres across the Martian plains—possibly lubricated when hot lava melted buried ice.

Researchers placed 650 geophones along Yellowstone's roads and sent a vibrating truck to 110 different spots to deliberately shake America's most-visited supervolcano, and the echoes revealed a layer 2.4 miles down that is roughly 86 percent solid rock.
