SCIENCE CAPSULES

      Let a man named "A" be traveling in a train at a speed of 100 km per hour.  He is comfortably sitting in the seat no.10 of the compartment "A1".      Let another man called "B" be standing in the open field where that train is passing through.  Let us assume that the man B is having a "special instrument" using which he is able to follow the train and also able to watch what is happening in the compartment A1 in detail.      Let A toss a coin  and B watches that event from outside the train.  Now, put a question to A,  "Where you tossed the coin and where it had fallen?"  He will definitely answer like this " I have tossed the coin in this compartment A1 and it has fallen near my feet.  It has not gone anywhere else.  Why this question?"      Next, put the same question to B.  He will answer "the coin has gone up at one place but it has fallen a few meters away from the ...

     We will look at "the time" in various angles in this article.      It is said, today's atomic clock measure time accurately and it may make a error of one second in 5000 years.  We know, one day is based on earth's spin and one year is based on earth's revolution around the sun.  It is again said, earth slows down slowly.  So they add a second  to"a year" every few years.      Earth is divided into number of time zones depending upon the appearance of sun at the place.  So we have a global average time called Greenwich mean time.  In space, earth's time is meaningless.  We may need a universal mean time for the future space explorers.       Place ice cube in a beaker.  The ice will slowly become water and then vaporize.  That is, the molecules become free and move randomly.  Hence the thermodynamics says, as the time progresses the disorder increases( entropy). ...