When did commercial aviation become common? Commercial aviation “took off” in the 1950s, but it wasn’t just changes in airplanes that made this possible, it was changes in society and the way people thought as well. And by common, I mean used by ordinary middle-class travelers. Commercial aviation started not long after the Wright brothers […]
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How does an email filter detect spam? Email filters detect spam by looking at the sender’s information, certain words in the email content, the structure of the email, and user engagement. Thanks to machine learning, they are much more accurate than they used to be. Spam filters have been around since the mid 1990s, which
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Are there any unpickable locks? There are probably no unpickable physical locks, but some modern high-security locks are very difficult to disable. If given the right tools and enough time, pretty much any physical lock can be picked. And, if picking it is not possible, it can probably be drilled through, or even removed from
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Why does the Venus de Milo have no arms? They could have been knocked off after the statue was found, but they were most likely lost before the Venus de Milo was buried. The Venus de Milo is probably one of the most famous statues in the world. The whole statue is about 2 meters
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When was the first ATM? The first ATM (cash machine) was used on 27 June 1967. It was installed in the Enfield branch of Barclays Bank in London, UK. It was first used by a British actor called Reg Varney, which was part of the publicity to showcase the new machine and persuade people to
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Why did Captain Scott’s Antarctic expedition fail? Captain Scott’s Antarctic expedition basically failed because of mismanagement and the weather. Captain Robert Falcon Scott was a British naval officer and explorer. He led two major Antarctic expeditions. The first was the Discovery Expedition (1901–1904). It produced a large amount of scientific work, but it did not
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Why do zebras have stripes? Nobody knows the actual reason, but the main theory is that they deter biting flies. Other theories are that they could also be for camouflage or thermoregulation. There doesn’t have to be one single reason, and it could easily be a combination of all of these. There are three different
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Why did the Spanish Empire end? The Spanish Empire came to an end because of, amongst other things, mismanagement, the economic situation, involvement in too many wars, and overexpansion. The Spanish Empire is generally considered to have come to an end in 1898, but it was the result of things that had been going on
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Why do some places use revolving doors? A lot of places use revolving doors because they reduce heating and cooling loss, they keep noise and dirt out, they are easy to open, they are quiet, they don’t need power, and they can regulate the flow of people into a building. The first patent for something
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Does vitamin C prevent colds? No, vitamin C doesn’t prevent colds, but it can reduce the length of time people are sick by about 8 to 10%. Many of us believe that taking a lot of vitamin C will help to keep off colds, or cure us if we are sick. Research shows that such
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