A Lesson from Gita

On the last day before the terminal exam, our chemistry teacher was taking a revision class. She asked a boy the definition of 'unit cell'. He responded with some handly gesture and few words. She asked another boy the same question. He replied," Miss unit cell jaan ke kya keejeyega. Aapko kaam ka baat batate hain. Gita mein likha hai ki sach aur jhooth ke beech bas ek ungli ka antar hai. Sach woh hai jo aap aankhon se dekhte hain. Jo aap kano se sunte hain woh jhooth hai. Isliye yeh jo dikhaya(the previous boy) woh sahi hai."
Teacher replied with her trademark PJ. As a ritual, we burst out laughing to teacher's reply. That consumed another 5 minutes.