Knowledge N Fact4u

Why doesn't the planet Uranus explode if it contains so much hydrogen and methane ? •The planet Uranus indeed contains a significant amount of hydrogen and methane, both highly flammable gases. •However, the burning of methane or hydrogen requires oxygen. Simply but, there is no free oxygen on the planet Uranus.  •On earth, we are so immersed in oxygen that we tend to take it for granted. Many chemical reactions that require oxygen seem to just happen automatically on earth: metals rust, forests catch fire, and candles burn. •We may be tempted to ignore oxygen's role in a chemical reaction since it seems to be always there.  •But oxygen is not always present. If I place metal in a jar containing only argon, it will not rust. If I place a lit candle in a jar with no oxygen, its flame will go out.  •There is an easy demonstration you can do at home to convince yourself of this fact.  •Get a bowl and fill it about a quarter full with bakin...

Why is the sky not blue as seen from space ? •The daytime sky is indeed blue as seen from space. Look closely at any color-accurate photograph of earth taken from space and the blue tint of everything on the day side is unmistakable. This blue tint is the sky. •The daytime sky as viewed from space is not a solid, uniform blob of blue for two reasons: (1) there are white clouds in the sky which can be seen just as well from space as from earth's surface, and (2) the sky is not opaque. •Earth's atmosphere consists mostly of nitrogen molecules and oxygen molecules bouncing around as a gas.  •Air is close to perfectly transparent. It's a good thing, because the transparency of air is what allows you to see your computer screen and breath at the same time.  •However, air is not perfectly transparent. A very small amount of the light that passes through air is scattered in all directions instead of being allowed to continue traveling on in the forward directi...

Hello everyone, here we are going to talk about Swiss Bank. When a person hear the name of this bank the only thing that come to our mind is Black Money. When any kind Fraud occur we hear the name of Swiss Bank and Government also tell that he is going to bring all the black money from Swiss Bank. Swiss Bank is located  in Switzerland and was established in 1872 as Basler bankverein. According to Switzerland banking law bank officials cannot disclose the name of account holder name unless and until Swiss court order them. Swiss court give the order only when there is a criminal charge on account holder name for example money laundering, fraud etc. The account in Swiss Bank are secretive account. Anyone who open a bank account in Swiss Bank he has to complete his KYC as normal bank do. But they never reveal the identity and address of account holders name. The account is in coded digits. In bank statement the account holder name is also not disclosed to any one. Here Swi...

Does the back of a rainbow look the same as its front side ? •A rainbow does not have a back side. If you were to walk completely to the other side of the mist cloud that is creating the rainbow and turn around, you would not see a rainbow.  •You have to realize that a rainbow is not a stationary physical object. Instead, it is a pattern of light that becomes a stable image only when you look at it from the right angle.  •You may not have noticed it, but every time you look directly at the center of a rainbow, the sun is directly behind your head. This is the only angle at which the light pattern that constitutes the rainbow can enter your eye and therefore lead you to see it. •The sun is always in the opposite part of the sky from the center of the rainbow. This is because a rainbow is actually just sunlight which has been refracted and reflected.  •Refraction occurs when the sunlight enters and leaves the small spherical water droplets that co...

Air pollution in our country, par-ticularly in some of the urbancentres, has become a major public health issue. Depending on the region and climatic con-ditions, there are several contributory fac-tors that add to the pollution levels but vehicular emissions in metropolitan cities have emerged as a major source. According to official estimates, the number of vehiclesin the national capital surged to over 1.20 crore, including over 80 lakh two-wheelers.The number of vehicles per thousand population, too, increased considerably —from 317 in 2006 to over 550 in 2016 —leading to visible congestion on the roads.That vehicular emissions contain car-cinogenic material needs no emphasis. Butwhat has now come to light is that theinhalation of toxic airborne particles emit-ted by diesel and petrol vehicles can weaken bones and speed up the ageingprocess. This finding, based on a fairly largesample size taken from the vicinity of Hyderabad,quantifies on the basis of X- Rays and other studies and...

How can we unlock the 90% of our brain that we never use ?  •Healthy humans use all of their brain. There is no part of the brain that goes unused. Certain tasks work certain parts of the brain more, but they all play important roles.  •Brain maps, as found in modern anatomy books, indicate that each part of the brain has a specific function essential to a healthy human.  •If there were a part of your brain that really went unused, then you could safely damage that part in an accident with no ill effects. But decades of medical records show that damage to any part of the brain has severe effects.  •If 90% of the brain were not used, then 90% of the brain tumors would cause no problem. Imagine brain doctors telling 90% of their cancer patients, "I have good news and bad news. Bad news: you have a brain tumor. Good news: it's in the part of the brain that you will never use." The thought is absurd. •If the 10% myth is instead supposed to mean...

Why do my fingers absorb water and become wrinkled? •Human finger tips do not become wrinkled, because they absorb water.  •Skin is a fairly good barrier that keeps out most of the external water. •If our fingers did absorb a significant amount of water after staying in the pool or bath for several minutes, then our fingers would swell to round, plump shapes, which is the opposite of wrinkling.  •The wrinkling is actually caused by a reduction of fluid inside the finger tips. •How can our finger tips experience reduced fluid internally when exposed to increased fluid externally? •From a physical perspective, this effect seems to be a paradox. The answer is that the wrinkling of wet finger tips is an active biological response, rather than a passive physical effect. •Scientists have known for almost a hundred years that nerve damage in the hand can result in a person no longer being able to get wet-induced finger wrinkles. Finger wrinkling is there...