LIGHT CANNOT SEE ALL

EBOLA VIRUS

Imagine a huge ship standing in the ocean near the beach and also a football floating on the ocean waves. The waves does not care the football. That is, the waves are not at all disturbed by the ball. But the waves are deflected and reflected by the ship. So the ocean waves "sees" the ship because it is bigger than the wave. But the waves are "blind" to the ball because it is smaller than the waves.

A virus or a group of molecules are having the size in the order of nanometer(10^-9m). But the wavelength of visible light is in the range of 10^-6 to 10^-8 m. . Since light waves are bigger than virus like object, it cannot see them. Hence the optical microscope fails in this region.

So people turned to use other waves. They found that the particle electron behaves like waves. Its wavelength is smaller than that of light (10^-10 m). Hence electron microscope was built at very high cost. Today we have variety of electron microscope. Our knowledge expanded due to this microscope. No doubt, the man will push the boundary further.

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THE EARTH, A SUPER ORGANISM

JOIN MY COURSE: "Become a programmer in a day with python" A man called 'love lock' (what a name) proposed a theory called Gaia theory, named after Greek Goddess. It says, "Earth is a self-regulating organism like a human being. The organic life in it interacts with in-organic matter and maintains atmosphere, temperature and environment". Hence the earth is still suitable for the life to thrive. Imagine, in a particular place, there are lot of flowers. Some flowers are white and some are darkly coloured. We know, white reflects light and heat while dark absorbs the same. White flowers can thrive in hot climate. But dark flowers requires cold climate. The absorption and reflection balances and the environment reaches average, warm temperature at which both the flowers can co-exist. This is the essence of "Gaia" theory. On our earth, ...

DISORDER IS THE "ORDER OF THE DAY"

Imagine a balloon full of air. The air molecules are moving randomly inside the balloon. Let us pierce the balloon with a pin. The air rushes out. Why should not the air molecules stay inside the balloon safely and ignore the little hole? That is not the way the world works. The molecules always "want to occupy as many states as possible". Hence the air goes out in the open to occupy more volume. The things always goes into disorder (entropy) and the disorder increases with time. The above statement is what we call "second law of thermodynamics". Consider a cup of coffee on the table. Suppose the heat from entire room flows to your cup of coffee, the coffee will boil and the rest of the room will freeze. Freezing means bringing things to order and arrangement. It violates the second law. Hence it will never happen. Hence heat must flow from high ...

THE WORK HORSE "="

One cannot think of a mathematical step without 'is equal to ' . It balances right hand side and left hand side. It aids simplification and manipulation of a mathematical expression. example: 2(A+B) = C 2A+2B = C 2A = C-2B A = C-2B/ 2 In an electronic calculator, the pressing of ' = " sign executes an asthmatic expression or simply calculates. In computer languages, it plays very important role. A = B When a computer looks at this expression, the value stored in the location named B is just transferred to the storage named A . After execution both A and B will have the same value an...

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