- [Narrator] The internet is packed full of information you may have never have thought to ask, but that doesn't mean we always have the time or energy
to go out and find it. Lucky for you, I've compiled a list of
some interesting facts you're just too lazy to Google. (bright music) Why do we look better in the mirror? The real reason why we tend to shy away from our
appearance in photographs is a little more complex than just a bad hair day. Our mirror image is essentially a flipped version of our true selves, which means we're far more used to seeing someone who
doesn't really exist. When we anticipate seeing this mirror image in a photograph we set ourselves up for
instant disappointment, whereas friends and family will often see nothing wrong with what we consider a bad photo because that's the version
of us they always see. If that wasn't trippy enough, differing photographic focal lengths can also alter someone's
face shape entirely. So, can we ever truly
know what we look like? Why do we hate the sound
of our voice on camera? I hate to break it to you, but the jarring recordings you hear of yourself in videos are far more accurate
than the speaking voice you're so used to. The reason we're so shocked when listening to
ourselves back is because, while others only hear the sound waves conducted by air, the voice you know is a combination of external sound alongside the internal acoustics of our bones. Your voice reverberating around your skull produces rich, low-frequency pitches which don't exist externally, meaning our voices are
generally higher than we'd like to think. Why don't our eyes get cold? It might not have crossed your mind, but unlike other bodily extremities, our eyeballs aren't able to determine coldness or heat, which is down to a lack of
temperature receptor cells. In fact, the largest part of the human eye is nestled comfortably inside the skull, where they're constantly pumped with a strong supply of warm blood. As long as they're
inside a functioning body with additional bone, tissue and fat to keep them warm it's virtually impossible
for your eyeballs to freeze at sub-zero temperatures. Why does freshly cut grass smell so good? To put it plainly, that delightful scent wafting through the summer breeze is actually just the
grass screaming in agony. When grass is cut, a greater number of organic compounds known as green leaf volatiles are released to aid the plant in closing the wounds
when producing new cells. This combination of eight
oxygenated hydrocarbons along with alcohols and aldehydes, which make up the GLVs, also happen to be pleasing to the human nose. so next time you stop
to take a long sniff, just remember it's the
sweet smell of trauma. Why does sun make our skin
darker but hair lighter? After a day in the sun, your skin will probably be browner, or redder if you forgot the sunblock, but your hair will probably
turn a shade lighter, and this is all down to
the power of sun damage. In both cases, sunlight
breaks down melanin, the pigment responsible for the color of hair and skin, but with one key difference. When sun bleaches and destroys melanin in your hair it becomes lighter. And since hair isn't a living thing, it'll stay that way until
new follicles grow in. On the other hand, skin is equipped to respond to this damage by producing more melanocyte cells which protect us from
harmful UV radiation, darkening our skin. Why is snow so quiet? As it turns out, there's a scientific reason why snowy landscapes are associated with peace and quiet. As fluffy snow accumulates on the ground, it acts like a sound absorber because it's essentially a porous material like foam, and as snow doesn't hit the ground with nearly as much force as water even the heaviest snowstorm can seem relatively silent. Snow also stacks up with a lot of air between flakes, which means sound waves
have less surface area to bounce off than raindrops, for example, making most sounds seem muffled. Why can't robots press the I am not a robot box? With modern developments in AI, it's hard to believe that a robot couldn't just declare
itself as a human online. Fortunately, though, the
anti-bot CAPTCHA system has been specially programmed by Google to record a multitude of human actions like the number of accidental key presses, mouse
clicks, taps and scrolls made on the page. Similarly, while an AI bot would probably move quickly in a
straight line to the box, human reaction tends to
be delayed and imprecise. Experts say it's almost impossible for a bot to replicate a human. but, if you practice hard enough, you can probably trip the CAPTCHA into thinking you're a robot. Why do birds fly in a V-formation? What seems like a common practice for migrating long-winged birds like Geese has actually baffled scientists for years until very recently. In 2014, a study focusing on Ibises unraveled the mystery by determining that it's a handy energy-saving technique similar to how squadrons of planes can save fuel in a V-formation. Each bird is perfectly positioned to time their wing beats to the bird in front so that they catch the uplifting currents ahead, which gives every member of the flock a little break in rotation. The leading member directs the flock while also providing swirls of air to the those behind, and this ingenious chain of piggybacking can even use 20% to 30% less energy. Why do blood tests use your ring finger? Routine blood tests
aren't always pleasant, but it seems they could be worse if nurses didn't always
choose the ring finger. Firstly, your thumbs and pinky fingers contain tendons which communicate with the entire hand and wrist, so getting an infection here could spread to the entire arm. Of the remaining fingers, your ring finger is used the least, meaning that the skin is more delicate and easier to puncture with less pain, and the wound will also heal much faster. Why does time pass
faster as you get older? If you feel like the years are getting shorter with age, it might not be all in your head. Using simple philosophy, designer Maximilian
Kiener has created a graph which demonstrates how
the longer you live, the relative significance of each year of your life decreases. For instance, a two-year-old will experience a full
half of their young life in a single year. While for an average 30-year-old, each year is just 3.33% of their life. And in your 60s, this could drop to just 1.67%. It all comes down to a loss of novelty. While children are constantly taking on new information, we settle into day-to-day life as adults, and things become routine. Why is shampoo foam always white? With hundreds of types of shampoo on supermarket shelves, it might seem strange that
the lather is always white, but it comes down to simple science. Firstly, the dyes used in shampoo are already highly diluted and only become more so as they're mixed with air and water molecules to create bubbles, like a red balloon being inflated until its color fades. It also has to do with
the scattering of light, as light rays striking the tiny bubbles get redirected in various directions due to vast irregularities in the foam's molecular makeup. These countless light-scattering surfaces make it almost impossible
for the human eye to detect any remaining colors. What causes motion sickness? Motion sickness is a
frustratingly common ailment, and the nauseating sensation you feel is just a result of mixed signals being sent to your brain, which causes confusion. Your inner ear has a big role to play. Two sacs located in the
semi-circular canals called the saccule and the utricle contain fluid which tells the brain about any imbalances, which is how we know when we're stood up or lying down. On a boat, for example, your inner ear can sense the rocking of the waves even though your eyes might
not be able to see it, causing your brain to try and make these two
conflicting feelings agree, which makes us feel queasy. What causes brain freeze? Brain freeze can put a real downer on cold treats like ice cream, and these short-term headaches occur when something extremely cold touches the upper palate or roof of the mouth while rapidly consuming
icy food and drink. This kind of stimulus
causes vasoconstriction, or narrowing of the blood vessels, and resulting nerve pain, which is generally alleviated by rewarming the upper palate to widen the blood vessels
through vasodilation. Quick fixes like drinking warm water or pressing your tongue to the roof of your mouth can get the blood flowing again and stop the brain freeze. What is the pink part of our eye? Almost every part of the human body has its own function, but that might not be so true when it comes to the small pink corner of your inner eye. The scientific name for this fleshy substance is caruncle, and the truth is it's
actually pretty useless. The creepy thing is that the caruncle is basically the evolutionary remnant of a third eyelid which reptiles, fish, amphibians and birds still possess to cover their eyes in a thin film and keep out harmful bacteria. Humans unfortunately no longer require a horizontal eyelid, so we're left with a small portion which no longer functions. Who knows, it might eventually
disappear altogether! How can you emergency call without signal? If you find yourself
in a survival situation and in need of rescuing
or medical attention you'll need to make an emergency call, but being out of service isn't always what it seems. In these situations, a no network available message only refers to your own
specific carrier network, and your mobile phone is actually equipped to piggyback on any
other network in range. This lifesaving feature
has been a staple since the Global System for
Mobile Communications was established in the early 1990s, and only when there is no coverage for any network in the area will you be truly stuck. Why do we get Goosebumps? Goosebumps are one of our bodies many involuntary reactions, but there are actually a few explanations for the strange phenomenon. Tiny elevations are caused when miniature muscles contract and create shallow depressions and surrounding protrusions on our skin, causing our hairs to stand on end. This is inherited from
our animal ancestors whose thicker hair would create a fluffy layer of warmth
and insulation in the cold, since we now have less body hair, we're left with visible pimples which make us look like
human-sized poultry. Goosebumps can also occur in times of stress or heightened emotion due to a sudden rush of adrenaline, much like how a cats hair
stands up when threatened. Why do we only see one side of the moon? Believe it or not, no matter how often
you gaze up at the moon you'll have only ever seen one side. This is because the moon rotates around the earth at the exact same speed as it rotates around its own axis, which takes about 27 days, meaning that the same side is always facing us. If the moon didn't spin at all, then it would alternatively show its near and far sides during orbit. What is known as synchronous rotation or tidal locking prevents us from seeing
the other hemispheres, and it's been this way for an estimated four billion years now. As the Earth's gravity
gradually tugged at the moon, it deformed it's shape slightly to face us and slowed it's rotation, becoming tidally locked. Where does airplane waste go? Most people know by now that airplanes don't
just drop human excrement out of the sky at high altitudes, but the truth is far less exciting. In the 1980s, airplane toilets relied on the same blue deodorizing liquid as porta-potties, known as Anotec, to push waste from the bowl into onboard storage tanks, but this had some drawbacks. Besides the increased fuel consumption involved in carrying the fluid, the systems were prone to leaking waste which would freeze into blue ice capable of plummeting through the air and causing some serious damage. Nowadays, aircrafts use
a safer Kepner system involving a powerful vacuum which sucks everything
down within seconds. Tanks holding up to 20 gallons of waste are then safely pumped out after landing, so no need to duck for cover. Why do soda bottles have bumps? The distinctly bumpy design of most popular soda bottles is probably not something you ever thought to question, but there's a legit reason why they aren't just
flat-bottomed like water bottles. The standard five-pointed bottom is not just a way to
make them seem fancier, but a matter of stability. Soft drinks like Coke and
Sprite are served chilled, so the plastic bottle needs to withstand the change in volume that happens when the liquid increases in temperature without toppling over. Soda is also aerated, and a flat bottom would bulge when the bottles are pressurized to fill the gas as the
drinks are carbonated, so the five feet are far more robust. Which of these interesting
facts amazed you the most? Let me know in the comments below, and thanks for watching!
