Aadhi's first train travel was from Madurai to Villupuram. He watched the trees and started saying "தென்னை மரம்" which means coconut trees. I used this opportunity to teach numbers. When there was one tree, I taught "ஒன்னு" when there was one tree, "ரெண்டு" when there were two trees. I am introducing words and names of animals and birds, almost every thing in Tamil. When there was many trees in groves, he said நிறைய தென்னை மரம். Then he stated counting the cows, goats from his windows. He was busy learning numbers or counting till we reached Villupuram.