Gina A. asks: Is the ocean continually getting saltier as salt comes in from the rivers or is there some way that the salt gets moved back onto land? Most sea salts come from water-caused erosion, whereby rivers ultimately carry the dissolved salts to the oceans. Absent a few key processes, the ocean’s salinity would continuously increase; however, there are […]
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If we were to tell you that there is a parasite out there that can infect virtually any warm-blooded creature on Earth; is found just about everywhere; approximately 33% of humans are infected; and is also mysteriously linked to people committing suicide and brain cancer, then we told you that it was most commonly found in cats, you’d say we […]
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Terran N. asks: Why do some people have different colored eyes? The Basics of Eye Color Eye color is a function of pigmentation both at the back of the iris (iris pigment epithelium) and in its stroma (the front of the iris), as well as the density of the cells in the stroma. In most cases these factors, and hence […]
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Ryan D. asks: Does the dangly thing in the back of my throat serve any purpose? Hanging from the back edge of your soft palate, the palatine uvula seems to serve several functions, none of which are particularly necessary for most people, which is why it can generally be removed with few, if any, noticeable side effects. In fact, in […]
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Jay G. asks: Why do fruits change colour and flavour when they ripen? Fruits and vegetables (see: The Difference Between Fruits and Vegetables) come in a wide array of colors that change throughout their ripening process, with the brightest colors often occurring when the fruit is optimally ripened. But why do fruits change color at all? There are two ways […]
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Jared U. asks: Why isn’t normal body temperature the temperature that humans are most comfortable in? Each summer as temperatures approach 98° Fahrenheit (about 37° Celsius), we hear news stories about people suffering (and sometimes even dying) from overheating. Yet these temperatures are essentially the same as normal body heat. So why isn’t this a comfortable temperature for us? Our […]
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Roman S. asks: How does spitting in swimming goggles keep them from fogging up? The “fog” you may sometimes experience on your glasses or goggles occurs when atmospheric humidity near the lens condenses; this happens due to a relatively significant discrepancy between the temperature of the lens and the surrounding air. As the surface attempts to reach an equilibrium between […]
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Harry K. asks: Why are raindrops always so small. Would it be possible to have a single raindrop that contains gallons of water? At only about half as wide in diameter as a U.S. penny, the largest raindrops ever recorded, between 8.8 mm and 1 cm, were observed by scientists in the clouds above Brazil (1995) and the Marshall Islands […]
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B.Nice26 asks: Is there really such a thing as a truth serum? It sounds like something taken directly from the pages of Harry Potter—truth serum, or drugs that “make people tell the truth.” Somewhat recently a U.S. judge approved the use of truth serum on James Holmes, the accused Aurora, Colorado “Batman” shooter. So clearly the answer to your question […]
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Kaiden asks: What causes the dark circles under my eyes when I’m tired? It is often claimed that periorbital dark circles are caused by tiredness or working too hard or even just staying up late. While this can be true, the truth is that your genes play a huge role here. So what exactly is happening when you get dark […]
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Laura K. asks: Why does the yolk of a hard-boiled egg sometimes turn green? The process of hard-boiling an egg involves denaturation. During this process, the amino acid chains found in the proteins in the egg are altered from their original, raw egg state, with the denaturation temperature varying somewhat depending on the specific protein in question (see chart here). […]
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Nathan K. asks: Is it true that mosquitoes are more attracted to some people than others or does it just seem that way? Female mosquitoes can put a damper on any outdoor event when they start to snack on those present. (Note: only the females drink your blood; they don’t need it for their own nourishment, but for certain nutrients […]
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Our resident medical expert, Scott, and a buddy of his recently started The Medicine Journal, where you can learn all sorts of interesting facts about all things medical related. Below is a sample article from their site. Much like bathroom-humor at the dinner table, hemorrhoids can be a taboo subject. The truth is, everyone has them. Their job is to […]
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Medical science has advanced an astounding amount in the last 50 years or so and we can do things today that a half a century ago even in that era’s science fiction would have been considered science fiction. By the same token though, there were things done in the 1950s and 1960s that people today are still skeptical actually happened, […]
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Chris G. asks: We know there is a coldest temperature at absolute zero. Is there also a hottest temperature possible? The idea of absolute hot springs from its better-known cousin, absolute zero, which, as you may recall, is 0 K, -273.15° C or -459.67° F. And although abridged definitions of the lowest temperature will frequently state it is the point […]
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Sam asks: If you gave a color blind person something like LSD or some other sort of hallucinogenic drug, would they see colors they couldn’t before? First a little primer on colour blindness from the good people at ColorBlindAwareness.org: Most color blind people are able to see things as clearly as other people but they unable to fully ‘see’ red, […]
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Jon K. asks: Why do I sometimes naturally bite my tongue when concentrating on things? The short answer as to why some people bite their tongue when concentrating is that the tongue requires a surprising amount of brain power to manage- beyond general motor control, it’s covered in various types of sensors constantly providing feedback to your brain about what’s […]
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Noah R. asks: What causes people to be claustrophobic? If you have a friend who refuses to ride the elevator to his 15th floor office every day, he may be a fitness freak, but chances are, he is claustrophobic. Similarly, when someone’s action seems illogical as shown by their persistent, determined avoidance of enclosed spaces or restrictive clothing, the likely explanation […]
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