James asks: Is it true that your body has no mechanism for detecting oxygen levels directly and instead measures carbon dioxide levels? That’s not entirely correct, but the human body does care more about carbon dioxide levels, than oxygen levels, something which might be surprising to some given that the purpose of breathing is to provide our bodies with the […]
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Although modern medicine has made tremendous advances in many areas, even mapping the human genome, there remain aspects of human health that continue to elude our full understanding. Alien hand syndrome is one of these puzzles- with its sufferers having one of their hands, usually the non-dominant one, acting as if it has a mind of its own. Many of […]
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Hunter asks: Why do people breathe into a paper bag when they get really excited? It’s all about pH balance. No, not the skin pH that keeps some deodorants “strong enough for a man but pH balanced for a woman”- rather the pH within the body. The human body has two main mechanisms for controlling pH, one involves the kidneys, […]
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Rick A. asks: Is it true that your body craves foods that have things in it your body currently needs? Have you ever gotten up in the middle of the night and absolutely had to have cheesecake? Ever had your pregnant spouse beg you to get her pickles and cheese to go with a peanut butter and banana sandwich? Food […]
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We all have pet-peeves that occasionally happen around us- windshield wipers on when there isn’t enough rain to support lubrication, your husband leaving his dirty laundry on the floor, etc. One of mine is supposed experts in their field saying things about their field that just aren’t true, like a doctor claiming you only use 10% of your brain. In […]
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It turns out that something that is (usually) flushed down the toilet can actually be recycled into a number of useful products. Comprised of water, calcium, chloride, potassium, sodium, magnesium, urea, creatinine, nitrogen, uric acid, ammonium, sulphates and phosphates, urine’s beneficial ingredients can be separated from its waste, and used to make fertilizer, medicine, brain cells and, yes, gunpowder. Why […]
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Ron asks: What causes the “Will O the Wisps”? For those who don’t know, Will-o’-the-Wisps, also called “ignis fatuus,” Latin for “foolish fire”, are balls of light that are seen hovering over swamps at night and look similar to flickering lanterns, with the light often being blue in color. Several theories exist as to its cause, including bioluminescence; that is, […]
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Jen asks: What causes pimples? Ah, acne! The facial blemish that powers many a pubescent date request rejection. Like millions of people worldwide, in my youth I waged a war with this aesthetic foe, with many a “Pizza-face” comment thrown my way. Medically known as Acne Vulgaris, this affliction is largely cosmetic and does not usually cause any debilitating problems, […]
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Amanda asks: How exactly do penises become erect? Well Amanda, the physical response causing a flaccid penis to become hard can be mediated by both physical stimulation (known as somatic) or autonomic (involuntary) processes like arousal from an attractive person, or a combination of both. We’ll first look at the anatomy behind the erection and then talk about how the […]
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Michael S. asks: Why does testosterone cause more body hair? Testosterone is a steroid hormone from a group called androgen. Androgen affects many characteristics in our bodies, like the development of the male sex organs, the deepening of the voice during puberty, muscle and bone strength, and hair growth. Interestingly, the same circulating androgen, like testosterone, can increase hair growth […]
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Matt asks: Why does salt raise blood pressure? Well, Matt, it turns out a high sodium diet might not raise blood pressure, nor have any sort of adverse effect on cardiovascular health at all. But I’ll cover the theory on why salt raises blood pressure below- just realize it is just a theory and one not backed up by much […]
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Steven asks: Does eye-black do anything or do people just think it does? For those that don’t know “eye black” is the substance used to make the dark markings athletes place under their eyes that are supposed to prevent glare from outside light sources, such as stadium lights and the Sun. It’s also supposed to help with contrast recognition (being […]
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Have you ever looked at the shiny dome of your grandfather and wondered, “Should I start stocking up on head wax soon?” Statistically at age 30 you will have a 30% chance of going bald. This increases by 10% every 10 years. So someone 50 years old will have a 50% chance of being bald. Due to the genetic factors […]
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Aaron asks: Why don’t fingernails grow at the same rate? The short answer is that there is no 100% definitive known reason as to why nails grow at different rates. However, there is a really good theory (which also covers why fingernails and toenails grow at drastically different rates) that is backed up by an awful lot of ancillary evidence. […]
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Anyone who has watched a President through their term in office knows stress might be a cause for gray hair; the stress/graying hair effect is particularly notable in President Obama. If you have teenagers, you’ve probably even remarked to them the stress they cause you is making your hair turn gray. The truth is going gray really has to do […]
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Today I found out why salt preserves meat. While today salting meat as a method of preservation is generally only commonly used in such things as salted pork and the like, salt has been used as the primary method of preserving meats and various other foods as far back as history records. Salt has a preservative effect thanks to the osmotic […]
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From Andrew- Is Aloe Vera really good for your skin? Well Andrew, that’s a very good question, but the answer depends on who you ask. There are any number of naturopathic healers who swear by its use to treat any number of conditions ranging from sunburns, psoriasis, osteoarthritis, high cholesterol, to a cure for stretch marks. It can be found […]
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Jeane asks: A friend told me Chickenpox is a form of Herpes. Is this true? Yes Jeane, Chickenpox is one form of a Herpes Virus. Most of us are familiar with the 2 sexually transmitted types of Herpes: Type 1 (oral herpes) and type 2 (genital herpes). But actually, there are over 25 known viruses that fall into the Herpes’ […]
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