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...working on an engine bedded into the aeroplane fin. The four-engine 747 retained a clear place in the market because twin-engine planes must stay within a certain distance from an airport in case of engine failure. This allowed the 747 to achieve shorter journey times on the longest routes because it can use more direct flight paths. However, improving engine reliability...

...working for the networking company Cisco, warned that more than half a million routers in 54 countries had been infected by malware known as VPNFilter. Routers allow computers on local area networks to connect to the internet; you will have a small router (properly known as a modem router switch) at home to link your computer to a phone socket; and it is precisely these...

...work out its chemical composition and when it formed. All of these factors are useful in figuring out the origin of rocks. But without knowing exactly where the rock came from, would you have a complete picture about its 4.5-billion-year history? Could you tell if it was a piece of a much larger geological structure, or whether instead, it was a rare type of rock in the...