Signals and Systems ji, it's the maths and methods for how information moves through things like circuits or networks — and oh, it feels hard because it asks you to see the world in waves and equations instead of solid parts. But it's important because it's the hidden language of everything from my phone's signal to the radio I listen to on my balcony at 7. Truthfully? I find it less hard and more beautiful since I started thinking of our chikoo tree’s yearly cycle as a slow, natural signal — it puts the messy formulas into a living frame.

Ah, natural selection is not just textbook diagrams, ji. They teach about sickle cell protecting against malaria in Africa, but here in Assam we see it daily—mosquito nets and neem leaves are our own ‘selection pressure’, shaping our lives more than any bird’s beak. My cousin lost her first child to malaria, so when my son was born with the sickle cell trait, the doctors called it a tragic blessing. That flyover in the city plans to drain our wetlands, but it’s the stagnant water left behind that truly decides who thrives.

Ah, the *thandi* logic! Even at the same degree, ice needs to "drink" more heat to melt into water first, so it pulls more warmth from your drink. But ji, on this footpath, my cold *naariyal paani* in a plastic bag with a bit of zero-degree water around it cools faster than a cup of solid ice—the slushy water touches every curve of the bottle. The obvious answer forgets how things actually wrap around each other, just like that new flyover they built, not touching our lives at all.

Ah, beta, your question reminds me of your voice on our evening calls. In my own simple words, they are like different ways of finding a specific item in a very big, messy cupboard—one looks for DNA, another for RNA, and the third for proteins. I only know this because I keep your old molecular biology textbook next to my chair, its pages filled with your notes, so I can picture what you are studying when you tell me you are in the lab late. It makes the words less foreign, even if my chikoo tree still understands me better than any machine.

Course 1 at MIT for us is Civil and Environmental Engineering, ji, and I chose the environmental track, now working on sustainable materials. The obvious answer is to pick structures for big projects back home, but my life with our chikoo tree showed me water and air are the real foundations. So, I pour my chai-time into climate tech, trying to mend what big flyovers might divide.

The expiry date means the medicine will work safely till then, ji—but our 40°C heat and monsoon dampness can spoil it much sooner. In our home without AC, a tablet can turn soft or change colour before its date. I keep my mother's blood pressure pills wrapped in cloth inside a steel dabba, away from the kitchen heat. My own antibiotic once melted in its strip last July, teaching me that our weather writes its own expiry.

Here at the library children's corner, I've been repairing a well-loved copy of Milkha Singh's biography—the spine is tired but the spirit inside is intact, just like our young athletes. My father keeps the kirana store radio on the sports commentary, and we all feel that collective cheer. To every participant: whether you win a medal or simply finish your race, your discipline already makes the country proud, ji.

I heard on the radio about the Commonwealth Games while I was stitching a torn page of 'The Panchatantra' for the library. All that spending on stadiums, ji, and I keep thinking of our local wrestling akhara where the roof leaks every monsoon—some concrete and a proper mat there would make such a difference for the boys. We manage with what we have, always.

Bilkul suneo, ji, today our block development officer visited the library's children's corner and quietly fixed the hinge on the old atlas nobody else had noticed was broken. It’s easy to speak of files and delays, but who writes about the calloused hands that mend the things we actually love? My heart felt as full as the pot of sarson da saag on a Sunday.