Buzz
There are certain questions that linger at the back of your mind throughout life. You might find yourself wondering why something is designed the way it is, why an object always occupies a particular place, or why your body reacts a certain way. Yet, despite knowing that there must be an explanation, you’ve never been able to come up with a clear answer to these everyday puzzles.
Here are 10 questions that have left people scratching their heads, along with the straightforward answers that provide much-needed clarity.
10. Why Do Airplanes Have Ashtrays When Smoking Is Prohibited?
Smoking on airplanes is prohibited by almost all airlines globally. Aside from the fact that cigarette smoke is unpleasant for fellow passengers, smoking also poses a fire risk, potentially contributing to disasters like the downing of Varig Flight 820.
Despite the smoking ban, it's hard to miss the presence of ashtrays in airplane toilets. This isn't limited to older aircraft; even newly built commercial planes are equipped with ashtrays.
The reason for this is that the Federal Aviation Administration requires airlines to have ashtrays on board. Even though smoking is prohibited and planes are equipped with smoke detectors, the FAA anticipated that some passengers would still smoke. Offering a safe place to dispose of cigarettes was considered crucial for safety.
9. Why Do Books Have Pages That Are Left Blank on Purpose?
A significant number of books come with at least one or two blank pages, and some books even feature multiple empty pages with a note saying 'This page has been intentionally left blank.'
These blank pages aren't the result of publishers intentionally wasting paper, but rather a side effect of the printing method most commonly used. Books are typically printed on large sheets of paper—known as 'signatures'—instead of individual pages, allowing multiple pages (8, 16, or 32) to be printed at once. Machines then fold and cut the sheets into book form, but since the total number of pages won't always divide evenly by eight, extra pages are left over from the process.
Some books use these leftover pages as spaces for notes or simply include a message to reassure readers that no printing mistakes have occurred.
8. Why Do People Sneeze When Exposed to Bright Light?
About one-third of all people will experience an uncontrollable sneeze when entering a brightly lit environment, such as stepping outside from a dimly lit room. This strange phenomenon has puzzled scientists for centuries.
Sneezing is an automatic bodily response. It can be triggered by various stimuli, but it typically occurs due to irritation in the nose. However, in the case of the so-called 'photic sneeze reflex,' sneezing happens when someone looks directly at a light source. Scientists have put forward several theories to explain why this occurs, though none have gained widespread acceptance.
Most researchers now believe that the photic sneeze reflex may be caused by 'crossed wires' in the brain. The optic nerve, which detects light, is positioned very close to the trigeminal nerve, which controls sneezing. When the optic nerve sends electrical signals to the brain, it inadvertently triggers the trigeminal nerve, confusing the brain into thinking the nose is irritated, prompting a sneeze.
7. Why Does Hair Turn Gray?
This happens to everyone as they age. Around the age of 30—though it can start earlier—people begin to notice their hair slowly losing its natural color, gradually turning gray and eventually white. Despite its common occurrence, the reason behind this change is still not well understood.
Hair's natural color comes from pigment-producing cells known as 'melanocytes.' These cells produce chemicals that transfer melanin—black, dark brown, red, or yellow—to cells that generate keratin, the main component of hair. As people age, melanocyte cells deteriorate, causing less melanin to be transferred to the keratin, leading to gray hair. Over time, these cells stop functioning altogether, causing hair to lose all pigment and eventually turn completely white.
6. Why Do Stores Blast Air At Their Entrances?
It's common to be hit with a blast of air when entering a store or shopping mall. This isn't simply to cool you down. It's a technique used in many buildings, including restaurants, factories, and loading docks. Its main purpose is to regulate the indoor temperature by blocking air from entering or escaping through the entrance. During winter, it keeps cold air out, and in summer, it prevents cool air from leaving. This is especially useful when doors must stay open for long periods. Air curtains also help prevent flying insects and trash from entering, creating turbulent air that blocks them from getting inside.
5. What Causes Butterflies In Your Stomach?
Everyone has experienced the sensation of having 'butterflies in your stomach' at some point in their lives. This fluttery feeling in the stomach can arise for various reasons, such as anxiety about an upcoming event or excitement about a first date. Different emotions trigger physical sensations and changes in the stomach due to the 'brain-gut axis.' When the brain interprets emotions like fear or excitement, it activates the fight-or-flight response. This results in a surge of adrenaline to prepare the body for action, increasing blood flow to the heart, lungs, and muscles. With limited blood supply, less circulates to the stomach, which creates the familiar feeling of nausea.
4. Why Does Rubbing Alcohol Sting?
For years, people have been using rubbing alcohol to treat cuts and wounds. If you've ever applied it, you're familiar with the sting, often more intense than the pain from the cut itself. This sensation isn't caused by the alcohol killing bacteria, but rather a reaction it triggers in the body. When rubbing alcohol is applied, it affects the VR1 receptors in the skin, which are responsible for sensing heat. These receptors normally respond to high temperatures, but the alcohol lowers their threshold, making the body's regular temperature enough to trigger them. As a result, the receptors interpret it as a burn and send the pain signal to the brain, even though the skin isn't actually damaged.
3. Why Are Dreams So Hard To Remember?
At some point, everyone has woken up from an incredible dream, only to find that it fades from memory just moments later. It’s a frustrating experience, and despite various techniques aimed at improving recall, most dreams are typically only clear for a few minutes after waking.
Experts have put forward several reasons for the difficulty in remembering dreams. One explanation is that the brain's conditions during REM sleep, the phase where most dreaming happens, are not ideal for converting these experiences into long-term memory. The absence of the memory-enhancing hormone norepinephrine during REM sleep also plays a role in this process.
Another factor contributing to the challenge of remembering dreams is that during REM sleep, neurons in the hippocampus, which help with memory storage, may not function as they do at other times. As a result, these neurons misfire, causing them to mix with other neurons involved in recording memories, which leads to the dream fading away rapidly.
2. Why Is The Sky Blue?
On most clear days (except when it's cloudy or during sunrises and sunsets), the sky appears blue. This happens due to the way light is affected by various factors. Similar to how a prism bends light to form a rainbow or how a mirror reflects light, certain particles scatter light. When sunlight hits the oxygen and nitrogen molecules that dominate Earth's atmosphere, the light is dispersed, creating a range of colors. However, because blue light has a shorter wavelength than other colors, it gets scattered more widely.
This scattering effect also accounts for the variation of colors in the sky. Near the horizon, the sky tends to look lighter. This is because the light has passed through more air, scattering more and blending with other colors, which diminishes the blue hue. During sunsets, when the Sun is lower in the sky, the light travels even further through the atmosphere, scattering the blue light even more, allowing the red and yellow wavelengths to dominate.
1. Why Does Orange Juice Taste Horrible After Brushing Your Teeth?
Consuming anything right after brushing your teeth isn't the most pleasant experience. Toothpaste tends to alter the taste of anything you eat or drink, but drinking orange juice immediately after brushing is one of the worst combinations.
The culprit behind this unpleasant taste is the foaming agent in most toothpastes, sodium lauryl sulfate. This ingredient dulls the sweet receptors in your mouth, which means that orange juice and other foods or beverages won't taste as sweet right after brushing.
On top of that, sodium lauryl sulfate also breaks down phospholipids in your mouth that normally help to suppress bitterness. As a result, the toothpaste not only reduces the sweetness of orange juice but also heightens its bitter taste, creating a horrible flavor combination.
