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 […]
Read more
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 […]
Read more
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 […]
Read more
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. […]
Read more
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 […]
Read more
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 […]
Read more
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 […]
Read more
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’ […]
Read more
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 […]
Read more
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 […]
Read more
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 […]
Read more
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. […]
Read more
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 […]
Read more
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 […]
Read more
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 […]
Read more
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. […]
Read more
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 […]
Read more
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, […]
Read more