How does a ZIPPER works??

       

     A Zipper or Zip fastener is a mechanical device used for closing two open ends of fabric or any material. This small piece of engineering has a lot of applications. It is even used in Space suits and Pressure suits developed by NASA. 

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              The zipper consists two rows of teeths facing each other with a small offset. Each teeth is not placed exactly opposite to other teeth; It is misplaced by a small distance.

Why February month has the least number of days?

            February being the second month of the year, has the least number of days. How was February chosen to have the least number of days?

The present day calendar which is used worldwide today, is called the Julian calendar. The original calendar has the same 12 months and 365 days a year and 366 days for a leap year. When the calendar was first introduced; March 1 was celebrated as the new year because march was the first month of this original calendar. So February was the last month and it was allotted with the remaining number of days. This is why February has the least number of days. February remained as the last month of the year until 450 BC when it became the second month of the year.

Why TANKER TRUCKS are made cylindrical and not cubical?

               Many kinds of liquids are transported by road and railway. The tanks carrying these liquids are made cylindrical in shape and not cubical. Why is this so?  If tanks are made in cube or cuboid, the capacity of the tanks will increase and they can hold more cargo. Even the large tanks used in refineries for holding the petroleum products are cylindrical in shape.

Why do Soft Drink Bottles have 5 bumps at the bottom??

               Soft drink and soda bottles, especially those made of plastic are not flat bottomed. The foot of the bottles usually has 5 bumps (corrugation). The bottles are not designed so to give it a fancy look. This post details you about the engineering in bottles. You will not find these bumps in water bottles or juice bottles. Water bottles have small indents to improve the stability of the bottle.

  
               The bumps or the corrugations in the foot of the bottle increases the strength of the bottle. Take a sheet of paper and fold it. You can easily fold the paper. Now bend any one side of the sheet and try to fold it. You will now feel some resistance. Now, roll the paper into a pipe and try folding it. It will be little hard to fold the paper pipe. Bending any material increases its strength and rigidity. This is because; rolling the paper increases its moment of inertia around the bending axis. 

Where does the water dripping out of your Air Conditioner come from?

               The water dripping out is same as the water droplets which forms over a cold water bottle when it is placed outside the refrigerator. The moisture which is present inside the room gets condensed and comes out of the air conditioner as water. You may ask whether it is necessary to remove the moisture present inside the room. The answer is YES. 

              

                 Our living condition is greatly affected by the moisture level in air. Our body gets cooled by sweating. Sweat evaporates by taking away the heat from our body. If the moisture content in the air is very high, body sweat cannot evaporate easily and so our body will not get cooled effectively. This makes us feel very uncomfortable. This is why we feel uncomfortable even in a cloudy day in coastal areas and sometimes after rain. This is all because of high levels of moisture in the air.

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How to LIE without getting CAUGHT??

You would have  never thought that Lying is difficult. But yes, it is. This is because you don’t have direct control over your Subconscious mind. Our subconscious mind controls our body language which lets others know that you are lying. So if you are good enough to control your Subconscious mind, even a body language expert can’t find out your LIE.

When you lie, you think of the TRUTH and create a LIE on your own. While you lie, the words what you speak and thoughts in your subconscious mind Clash with each other. Because of this lie the subconscious mind sends out nervous energy to various parts of our body which appears as a GESTURE or some movement of any part of your body.

Who showed way to Messenger PIGEONS???

                  Pigeons were used for communication as early as 1150.It is said that the Persians and Egyptians were the first to use MESSENGER PIGEONS. Pigeons were effective as messengers due to their natural HOMING ABILITIES.This method was used before the use of TELEGRAPHS. Pigeons were used by kings for sending urgent messages. They were even used during Franco-Prussian war and as military messengers during World War II. 

         

                WHO SHOWED WAY TO THESE PIGEONS? How did these pigeons knew their way to their destination?? How long and how fast can they fly?? You will know the answers for all these questions after reading this POST.

Need of Air Conditioning for Electronics

                Electronic equipments are very sensitive. Most electronic equipments are kept in an Air conditioned room to protect them from high humidity and over heating. 

                 Air Conditioning is different from air cooling and refrigeration. In refrigeration and air cooling, only the temperature is lowered. In Air conditioning, in addition to cooling the air, the humidity, oxygen level and many other things are taken into account. Air conditioners don't just cool the air, they suck out the moisture present in the air. This is what we see in the form of water droplets dripping out of the air conditioning machines. This reduces the humidity of air and makes the air cool and dry.

Why do CLOCKS rotate Clockwise??

                   Clocks are used all over the world and whereever you go the clock's rotate in clockwise direction. This standard for the rotation of clock hands is regularly used to refer to the direction of rotation - "Clockwise and Anticlockwise". The explanation below also tells you why we celebrate New year at Midnight.

                The early watchmakers hailed from Northern Hemisphere where shadows on sundials moved West to East as the day progressed. The direction of the shadow of the sun dial is the reason for the direction of the clock.