Why are we taught Sanskrit in school?

Many times, during random discussions, people have asked why we are taught Sanskrit or Bernoulli Principle or Trigonometry or Organic chemistry or even Statistics when  most of us do not use it now. They mention most of the things taught in school are not required now, in practical life or day to day life and hence is irrelevant. 

Well earlier I used to partially agree with them. But after lot of thinking I have come to the conclusion that learning them was not a futile exercise. On the contrary they are very much relevant and necessary. I will summarize my thinking into two main reasons.

Reason number 1, which is the most basic one. We do not (or most of us don't) know at that age what career/lifestyle we would choose years down the line. We are taught all spectrum of topics and at a basic level, so that we can try everything hands on and then select which field of knowledge is to our liking and pursue further studies on that. Also getting to know basic things in Physics, Chemistry, Mathematics and Biology help us when Doctors, Rocket scientists etc explain something in "lay-man" terms.

Okay so you are able to digest requirement of teaching physics and geography, but why Sanskrit. Well that takes me to reason no 2.

Reason number 2, and this is the most important one. Learning and understanding these subjects are like exercise for brain. Are you required to lift heavy objects in your job? Then why do you lift them in gym? Similarly, learning  help develop those neurons that can take up any other difficult job. I believe its the same reason kids are taught nursery rhymes, even though the rhymes are beyond their comprehension level.

So the all the noise you made while learning Sanskrit, that can be related to the grunting sound made while lifting weights in gym.

Can we all now not say why we were taught something in school days, when we do not require it now.