Why Do Onions Make Our Eyes Water?
Why Do Onions Make Our Eyes Water? Onions contain mildly stimulating oil. This oil readily forms a vapor (gas), which escapes into the air when the onion is cut or...
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Why Are People with Bipolar Disorder Considered Dangerous to Others?
Why Are People with Bipolar Disorder Considered Dangerous to Others? During the manic phase of bipolar disorder, behavior can become reckless. This may increase the...
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What Are QR Codes and How Do They Work?
What Are QR Codes and How Do They Work? A QR code, which stands for Quick Response code, is the trademark of a specific type of two-dimensional bar code that was...
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What Were the First Mirrors?
What Were the First Mirrors? Probably the first mirror was the surface of a quiet pond. Our earliest ancestors must have noticed that they could see themselves in still...
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Why Did Dinosaurs Die Out?
Why Did Dinosaurs Die Out? Since their discovery in the nineteenth century, the reason for the dinosaurs’ demise has been a matter of speculation and debate. No...
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How Does a Sewing Machine Sew?
How Does a Sewing Machine Sew? Most home sewing machines sew with two threads. An exposed thread fits through the needle’s eye. Another thread, called the bobbin...
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When Were Pajamas Invented?
When Were Pajamas Invented? Traditionally, many Americans donned a long night shirt before going to bed up until the late 1880’s. But, after English colonialists...
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Why Does a Doughnut Have a Hole?
The hole in the doughnut allows the dough to cook more thoroughly. At first the doughnut didn’t have a hole. It was just a round, flat fried cake. In 1847, Hanson...
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Where Did the Word Yankee Come From?
Where Did the Word Yankee Come From? The origin of the famous nickname “Yankee” for Americans is a mystery. Scholars once thought it came from “Yengees,” the American...
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Why Are the Letters on a Typewriter Mixed Up?
Why Are the Letters on a Typewriter Mixed Up? Perhaps you’ve noticed that the letters on a standard typewriter keyboard are mixed up, rather than being arranged...
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