#1157 How does a lie detector work?

How does a lie detector work? Lie detectors work by recording breathing rate, pulse, blood pressure, muscular activity, and perspiration to look for any changes. They are not admissible in court because they don’t always work. The modern lie detector (polygraph) was created in 1945, but there were many steps along the way. The first

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#1156 Where did 0 come from?

Where did 0 come from? The concept of the modern zero was invented in India, but the idea of a placeholder for numbers was thought up by the Mesopotamians. We take the idea of the number 0 for granted. We use it regularly throughout the day (probably) and many of the things we use would

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#1155 Was the transition from silent movies to talkies difficult?

Was the transition from silent movies to talkies difficult? Yes, the transition from silent movies to talkies was difficult, not just technologically, but also for the actors. Movies began to appear alongside the invention of photography. Early photographs took hours to take, but once it became possible to take photographs instantly, movies were the next

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#1154 Was the Trojan Horse real?

Was the Trojan Horse real? The Trojan Horse was either made up by Virgil in the Aeneid, was actually some kind of siege engine, or was a boat usually used for giving tribute. We all know the story of the Trojan Horse. During the Trojan War, in approximately the 13th century BC, Greek warriors were

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