science knowledge

  A heart attack or myocardial infarction is the complete blockage of blood flow to a part of the heart, causing its muscle cells to die. Image of complete blockage of blood flow A network of blood vessels called coronary arteries continuously supply oxygenated blood to muscle cells of heart to keep them working properly. Coronary Arteries of the Heart However, due to bad lifestyle choices and stress , Image of stress   cholesterol and fats start building in these arteries reducing blood flow to the muscle cells. This buildup is called plaque . Plaque is the main culprit behind most heart attacks. Image of heart attack  When plaque ruptures, a blood clot forms around it causing the artery to get completely blocked. The blood then cannot pass further to that part of the heart. Thus, due to lack of oxygen, the muscle cells in that part die. This condition is called a heart attack.

   If we consume a lot of sugar, then it can lead to serious health problems. For example: Image of sugar  A hormone called leptin tells our brain when to stop eating. However, consuming excess fructose which is a type of sugar can cause leptin resistance , a condition in which our brain does not respond to leptin. Hence, we overeat, resulting in obesity . Moreover, excess sugar is converted into a type of fat called triglycerides . Triglycerides can enter the bloodstream and form fatty deposits or plaques in blood vessels, increasing the risk of heart attack and stroke etc.  Image of heart attack  Excess sugar can even bind to collagen and elastin in our skin, damaging them and thus, making our skin saggy and wrinkly. Image of saggy and wrinkly skin .   Studies have also shown that women who have one or more sugary drinks per day are more likely to develop diabetes . Image of sugary drink. That's why  we need to stop consuming excess ...

   Onions consist of amino acid sulfoxides .  When we cut an onion, millions of onions cells rupture,  releasing the amino acid sulfoxides along with some special enzymes . Image of onions          These special enzymes react with amino acid sulfoxides to  form a chemical called   Syn-propanethial-S-oxide .  Amino acids sulfoxides  Syn-propanethial-S-oxide This chemical is volatile , that is, it easily evaporates at   normal temperature, forming a gas.         When this gas reaches to our eyes, it reacts with the substance that keeps our eyes lubricated and forms mild sulfuric acid .   This sulfuric acid gives us a burning sensation.   Now, in order to wash off this acid, our lacrimal glands    produce a disinfecting liquid . But when our eyes cannot hold any extra amount of disinfecting liquid, it starts to fall down, making us cry.

  Let's have a look at the advantages of cold showers: Cold shower Firstly , as we are warm-blooded , the sudden sensation of cold water awakens our body, thus making us feel fresh and alert.  Secondly , many scientists believe that when our body suddenly comes in contact with cold water, it sends a jolt of electrical impulses to our brain, helping boost our mood in the process.  Lastly , cold showers may contribute to weight loss as our body might burn more fat to generate heat. Hot showers have the following advantages:            Hot shower Firstly , scientists believe that hot showers lead to the release a hormone called oxytocin , easing anxiety and stress.  Secondly , as hot showers can help clear the nasal passage , they might be beneficial for a person suffering from cold.  Thirdly , hot water can help release tension and stiffness in our muscles.  Lastly , hot water can kill bacteria, thus preventing infections.

    Dry ice is basically solid carbon dioxide and it's  chemical formula  is  CO ₂. The surface temperature of a dry ice block is about  -78 degrees Celsius or -109 degrees Fahrenheit.  This means it is much cooler than ordinary ice which is made up of water . If dry ice comes in contact with our skin, our cells begin to freeze and  die  within seconds, thus giving us severe frostbite. In addition to this, storing dry ice in airtight containers can be  dangerous . Do you know why? This is because dry ice sublimates, i.e., it directly gets converted from solid state to gaseous state . Hence, in airtight containers, the gas produced can build up and exert pressure on the walls of container which can lead to a dangerous explosion. Dry ice is dangerous but it is also useful as cooling agent and to create dramatic scenes in theater by using fog machines . 

Please don't sleep under tree at night .  It is quite harmful.      See, during night you are not able to breathe properly, right? Do you know why? This is because during the day, in the presence of sunlight, plants takes in carbon dioxide and release oxygen in the process of photosynthesis . That is why production of oxygen is more than the production of  carbon dioxide during daytime.  Hence, if we sleep under a tree during daytime, we may get a  good amount of oxygen, thus giving us a nice sleep. However, at night, plants do not perform photosynthesis due to the absence of sunlight.  But respiration still goes on.  Hence, as compared to oxygen, the proportion of carbon  dioxide around the trees is more. It is not good for humans health.  Thus, if we sleep under a tree at night, we may feel suffocated due to lack of oxygen. Moreover, inhalation of excess carbon dioxide is harmful to  human beings. Therefore, it is not go...

 After  alpha , beta, gamma , and  delta plus  variant of covid-19 the new variant of covid-19  omicron  has came in market and has already started to spread all over the world.  Origin of omicron :   According to recent information County  Botswana  of the South Africa was place place where first case of omicron found. But it's not true actually south Africa was the one who informed all world about new variant omicron. That was south africa goodness.  After all this time, now know we know where omicron really came from. Now Netherland, Belgium and Germany revealed that omicron was already present in our country's before south Africa. According to Netherlands on November 19th they took some samples from Corona affected people and that's when they realized there is new variant of covid-19 and now they have announced  lockdown  in Netherland. In Netherland theaters, Bar, restaurants, will be close after 5 o.clock . That's me...

 Our teeth basically consist of three parts. The outermost part is enamel . Enamel is white in color. Beneath the enamel, there is dentine . It is yellow in color. Then comes the part called pulp , which has blood vessels and nerves . Now, when we drink or eat acidic fruits and beverages like lemon, orange juice, soft drinks , etc., they erode or wear away the outermost part called enamel and start exposing the yellow color dentine and thus, making teeth appear yellow. However, did you know that some people's teeth are naturally yellowish ? This is because in such people, the layer of enamel is thin, causing the yellow color of the dentine to appear more clearly and thus, making their teeth appear naturally yellow.