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...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...

...works. Ellen will need to cover one of Kate’s arms with the repellent and leave the other arm clear, so she can show that only the arm without the repellent gets bitten. But that leaves another problem, mosquitoes carry diseases that they pick up from biting other people, so Ellen needs to raise mosquitoes from birth that haven’t bitten anybody yet and so will be...