NO LIFE WITHOUT UPS AND DOWNS

A river flows from mountains to seashore - from top to bottom. If the surface is even, it cannot flow, it will only stagnate.

Air flows from high pressure to low; heat flows from high temperature to low; current flow from high voltage to low. For an engine to work, heat source at high temperature and a sink at low temperature to receive heat must be available.

In all automobiles, engine is the source and environment is the sink. That is why, in winter season, some two-wheelers are difficult to start. Because the engine should be heated up before working.

Our body is a kind of engine. It is slightly at higher temperature than the surroundings.No life in a cold body.

In the solar system, sun is the unique source at very high temperature and the rest of the planets in the system is the sink. Sun keeps solar system working and hence the earth ebbs with life(photosynthesis, rain, etc).

So we learnt that, ups(source) and downs (sink) are essential for the life to go on. Hence, in our day-today life also, ups[ gain, success, promotion, health], downs[loss, failure, demotion, ill-health] should be endured to keep the life in progress.
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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, ...

THE PARABOLA

A jet of water shooting from a hose pipe will follow a parabolic path. What is the so special about parabola. Y= x^2 Draw a graph for the above equation. It will result in a parabola. This parabola is also called unit parabola. Any equation involving square will yield a parabola. Example: Y = 2x^2 +3x+3 (also called quadratic equation) X= 2 and -2, both satisfies the equation 4 = X^2. Parabolic equations always have two solutions. Any motion taking place freely under gravity follows parabolic path. Examples: An object dropped from a moving train, A bomb dropped from flying plane, A ball kicked upwards. If a beam of light rays fall on the parabolic shaped mirror, they will be reflected and brought to focus on a point. This fact is made use of in Dish Antenna, Telescope mirrors, etc. ...

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 ...

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