00:00Observe your nails closely. Are they slightly striated?
00:04Several factors can be the cause, regardless of your skills in manicure.
00:09First of all, know that the condition of your nails can reflect health problems.
00:13However, vertical striations are generally normal, especially with age.
00:18It is a natural manifestation of skin aging, indicating a slowdown in cellular renewal.
00:24New cutaneous cells form less quickly, hence the appearance of this texture.
00:29However, if this is accompanied by other unusual symptoms,
00:33it could reveal a more complex problem, like a chemical imbalance.
00:38This can not only cause vertical striations, but also give a spoon shape to your nails.
00:44Avoid putting things in your ears, you have always been told,
00:48including cotton swabs, because even if you use them gently, you could cause damage.
00:55An interesting fact is that the insertion of objects in the ear can trigger a reflex of everything unusual,
01:01called Arnold's earwax reflex.
01:04This phenomenon is linked to vagus nerves, a long nerve that extends from the brain to the abdomen,
01:09passing through the ear and the larynx, with a detour on the side of the stomach.
01:14This nerve supervises various autonomous functions of everyday life,
01:18such as speech, digestion and other involuntary actions.
01:23The branch that connects the vagus nerve to the ear, known as the vagus nerve's auricular branch,
01:29is responsible for tactile sensations in this area.
01:32Stimulating this branch can trigger a cough, because the brain perceives a false presence signal in the throat,
01:38thus inciting the body to react with the cough to expel the imaginary intruder.
01:43You may also be deprived of a certain muscle in your arm, but this is not worrying.
01:50It is a relatively common congenital condition.
01:53This tissue, called the long-palmar muscle tendon, is absent in about 14% of the population.
02:01To check its presence, slightly bend your wrist and bring your ear closer to your thumb.
02:07If a tendon protrudes inside your wrist, it means that you have it.
02:11Otherwise, this is not a problem, because this muscle generally does not bring any significant advantage to the functionality of your arm.
02:19Here is a little experiment that you can try at home, without risk, to find out what your dominant nostril is.
02:26Even if you probably didn't know you had one,
02:29stand in front of a mirror, breathe through your nose and observe the formation of the bubble.
02:34Of course, two marks will appear, but in most people, one will be more pronounced.
02:40Indeed, we generally breathe more through one nostril at a time.
02:44According to some specialists, about 75% of our breathing comes from a single nostril at some point.
02:51This phenomenon alternates during the day, a process called the nasal cycle.
02:57Why not both nostrils at the same time?
03:00It seems that it is mainly to maintain adequate hydration, thus preventing a side from drying out too much.
03:09You may notice this difference when you try to fall asleep.
03:13By lying down on the right side, gravity pushes part of your nose to work more.
03:19Speaking of sleep, every time you try to rest in a new place,
03:24only part of your brain manages to fully enjoy a restorative sleep.
03:29This is explained by the fact that our brains tend to remain partially in a state of vigilance in an unfamiliar place.
03:36This observation explains why we often wake up in the middle of the night in a new apartment.
03:43It is a mechanism that we share with some birds and marine animals,
03:47able to sleep partially while remaining attentive to danger.
03:51Sleep researchers have found this phenomenon that they called the effect of the first night.
03:57In sleep studies, participants showed such mediocre results after the first night
04:04that it was often necessary to exclude these data.
04:06However, from the second night, the quality of sleep improved.
04:11Historically, this vigilance was probably an adaptive response to night threats,
04:17such as predator attacks, hence the need to keep part of the brain on alert.
04:22Unfortunately, there is no way to neutralize this reflex,
04:26which explains that after a night in a new place, you will probably need more coffee.
04:32And don't forget to subscribe to stay informed of our new videos,
04:36a little boost for these difficult days.
04:39It is also possible that every time you prepare to exercise,
04:44your heart activates before you even start moving.
04:49This phenomenon, called anticipated rise,
04:52corresponds to a reaction where the brain sends signals to the heart to encourage it to prepare for the effort.
04:58These signals are manifested by the release of chemical substances such as adrenaline and noradrenaline.
05:05This increases the heart rate, which increases blood flow and improves the oxygen supply to the muscles,
05:12thus preparing them for the physical effort.
05:15The performance of your heart directly influences the effectiveness of this process.
05:19The healthier it is, the smoother this transition is made.
05:24We have all heard stories of ordinary people
05:27able to lift very heavy objects in a situation of intense stress,
05:31like a mother lifting a car to save her child.
05:35This phenomenon, sometimes called hysterical force,
05:39cannot be reproduced in a laboratory,
05:41because it is impossible to simulate a real situation of imminent danger.
05:46These spontaneous and unexpected moments seem to reveal a kind of hidden force.
05:52However, even if we imagine that these people lift huge weights,
05:57their strength is not as impressive as it seems.
06:01Let's take the classic example of car lifting.
06:05One might think that they lift the whole car.
06:08But in reality, they only lift a part of it,
06:11the wheels remaining mostly in contact with the ground.
06:15In addition, the distribution of the weight of a car is not uniform.
06:19The engine is the heaviest part, contrary to the area generally lifted.
06:24As for the hysterical force,
06:26it is mainly about realizing that we are often stronger than we think.
06:30Usually, our muscles function in economy mode,
06:34using just what is needed to accomplish daily tasks.
06:38But in extreme situations,
06:40our body can mobilize a greater muscular power.
06:43Our organs are designed to be effective.
06:47Why require all our muscles to simply lift a cup of coffee?
06:52Even when we feel exhausted,
06:54it is likely that this is not entirely the case.
06:57Researchers estimate that even high-level athletes
07:00only use 60 to 80% of their muscular capacity.
07:04In addition to this efficiency,
07:06our brain also limits the complete activation of our muscles
07:10by an internal security mechanism.
07:12If we used all our strength,
07:14we would easily injure ourselves.
07:17The simple game of coucou is not only a fun for babies.
07:21They appreciate it enormously because it promotes their development.
07:25This game goes beyond the simple fact of covering
07:28and discovering faces.
07:30It helps babies to improve their ability to visually follow.
07:34It is also useful to understand the concept of permanence of the object.
07:39The fact that an object continues to exist even if it is out of sight.
07:44This awareness contributes to develop their skills
07:48in problem-solving as they grow up.
07:52In addition, playing coucou is an excellent way
07:56to arouse various positive emotions in babies,
07:59from surprise to anticipation,
08:01then to excitement and happiness.
08:05Some say they can manage with only 4 hours of sleep per night.
08:09However, scientists argue that most adults
08:13need 6 to 8 hours of quality sleep.
08:16In fact, sleeping less than this average
08:19can lead to a serious sleep deprivation,
08:22except if you are one of the rare super-sleepers.
08:25These unique individuals thrive with less than 6 hours of sleep each night
08:30and wake up naturally after only 4 or 5 hours.
08:34Only 1 to 3% of the population has this ability.
08:38It is important to note that this ability is genetic
08:42and cannot be acquired by training.
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