Ken J. asks: How is the calorie content in food determined? First, let’s make sure everybody here understands what a calorie is. A calorie is just a measurement of energy- the amount of energy needed to raise 1 gram of water 1 degree Celsius at standard atmospheric pressure. This makes sense when talking about calories in food. Food provides energy […]
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The condition is known as “prosopagnosia” / “facial agnosia”, or in less medical terms: “face blindness”. (“Prosopagnosia” actually literally means: “face ignorance”. “prosopon” = “face”, “agnosia” = “not knowing” or “ignorance”). Once thought to be incredibly rare, with only 100 or so documented cases up until the last decade or so, it’s now thought that around 1 in every 50 […]
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Tristan asks: Why are some people right handed and some left handed? Tristan it appears that there is no single mechanism that will definitively determine which hand you will prefer. Technology and further studies will continue to help shed light on the subject. What is known is that it essentially comes down to genes and biological asymmetry in the human […]
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Maya asks: Why does Chemotherapy cause hair loss? Maya I love the question. It seems like once or twice a year I’m shaving my head to help raise money for cancer research and at every fundraiser, the question seems to come up- Why does the common treatment for cancer make body hair fall out? The answer is really pretty simple. […]
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Frank asks: Does having sex before an athletic event really hurt performance in the event? Good question! There are two schools of thought on this particular issue, but the short answer is that it could psychologically (although no study has definitively proven it), and “no” physically (unless you need a reduction in testosterone to help with excessive anxiety and lack […]
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Jennifer asks: Why do people seem to get more colds in the winter? Well Jennifer, this does seem to be the societal perception, no doubt promoted by every overprotective mom telling their kids to put a coat on when going outside, because they might catch a cold. There are two aspects to this question. The first is temperature. Numerous studies […]
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Carmen asks: What do the numbers in a blood pressure test mean? Also, what types of things do these numbers tell doctors? Well Carmen, blood pressure is really just that- the pressure at which blood moves around the body in your arteries. The easiest and least invasive way to test what that pressure is at any given moment is to […]
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Steph B. asks: Why do Diet Coke and Mentos react with each other? If you’ve ever wondered why Diet Coke and Mentos react so strongly to one another, well, wonder no more. To start, it should be noted that it’s not just Diet Coke and Mentos that “react”; other carbonated beverages will also readily respond to the addition of Mentos. […]
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Today I found out that all humans can be traced back to a single female known as Mitochondrial Eve. This woman is thought to be the “mother” of all humans alive today. Seems like a big claim for scientists to make. So how do they know this? The simple explanation is that when an egg is fertilized by a sperm, the […]
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Myth: drinking alcohol warms your body and can be used to prevent hypothermia. In fact, drinking alcohol helps lower the core temperature of your body. This myth likely got its start thanks to the fact that drinking alcoholic beverages will make you feel warmer as your blood/alcohol level rises. As the Director of Clinical Pharmacology at the University of Iowa, […]
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Today I found out why doctors have men “turn their heads and cough” during a physical. Pretty much all guys have been there at some point or another. The doctor asks you to drop your drawers. They slap on their latex gloves, grab your junk, and ask you to turn your head and cough. One imagines this can’t exactly be […]
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Today I found out it is possible for your muscles and other connective soft tissues to turn to bone. The condition is known as Fibrodysplasia Ossificans Progressiva (FOP) or “Stone Man Syndrome”. It affects an estimated 1 out of every 2 million people beginning when they are children, and to date there is no cure. The telltale sign of someone […]
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Today I found out what causes lactose intolerance. Lactose intolerance is simply the body’s inability to digest lactose. Lactose is a disaccharide, or a molecule made up of two types of sugars, in this case, glucose and galactose. Most people have an enzyme (a protein molecule that breaks down other molecules) lactase in their digestive systems. This enzyme breaks down […]
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Myth: The instant you’re exposed to the near vacuum of space, you’ll lose consciousness, your blood will start to boil, and you’ll explode. (Other variations on this myth include you freezing near instantly from the extreme “cold” of space.) In fact, so long as you don’t try to hold your breath, which would result in your lungs rupturing and thus […]
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Today I found out why iodine is added to salt. Iodine first began being added to salt commercially in the United States in 1924 by the Morton Salt Company at the request of the government. This was done as a response to the fact that there were certain regions in the U.S., such as around the Great Lakes and in […]
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Today I found out why black lights make things glow. Black lights are not that different from any other type of light, whether incandescent, fluorescent, or just the age old candle flame. The difference is that black lights emit most of their light waves just outside the range humans can perceive, in the Ultraviolet (UV) part of the spectrum. When […]
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Today I found out how things become petrified, rather than just decaying normally. Petrifaction (also known as petrification) is a type of fossilization which leaves living organisms preserved as a type of stone. In order for this to happen, a specific set of circumstances has to be present when the organisms cease to live. When any living thing dies and […]
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Today I found out why beans give you gas. Beans contain a sugar molecule called ‘Oligosaccharides’. These types of sugars cannot be digested by the stomach or small intestine. They get passed on to the large intestine where numerous types of bacteria begin to break them down. During the process, the bacteria release several different types of gases, mainly hydrogen, […]
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