Shannon D. asks: How come people who smell really bad can never seem to smell their own stench? Have you ever sat next to a woman on a bus who lost her sense of smell? Or, at least, you assume so as the eye-watering fragrance wafting from her perfume is so overpowering that the nausea it induces makes you appreciate […]

Neal H. asks: Why do we put hydrogen peroxide on our cuts? As a child, did you ever skin your knee and fear telling your parents, afraid of your mom breaking out the brown bottle of pain containing hydrogen peroxide to “help heal” your wound? Given the agony it caused, you might have wondered whether the fizzing liquid was actually […]

Jerrod A. asks: How do trees pump water from their roots all the way to their tops and tips of their branches? Trees need water throughout their bodies, from the depths of the roots to the tips of their leaves, sometimes tens of meters above the ground. So how do they manage to get the water up there? To begin […]

Andrew C. asks: Is it possible to get the flu from getting a flu shot? Vaccines, in general, have been a massive boon to humanity. They’ve rid the world of an affliction that has plagued humanity for thousands of years in smallpox (for reference killing over 300 million people in the 20th century alone before it was eradicated), and have […]

Brenda V. asks: Is it true that men can breastfeed babies naturally? The ability to lactate exists in a variety of male animals, though male milk production is typically a rare occurrence. However, male Dayak fruit bats are commonly known to lactate. So what about human male lactation? Believe it or not, men can, in fact, lactate. Possessing all the […]

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 […]

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 […]

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 […]

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 […]

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 […]