Suddenly, he noticed a faint, pencil-scrawled note in the margin of page 142. It wasn't his handwriting.

Arjun passed his viva with honors. On his last day of college, he found himself back in the library. He tucked the old photo back into the PSG Data Book, but this time, he added his own slip of paper next to it.

The note was a revelation. Meera had identified the exact trap Arjun had fallen into—relying on idealized data instead of real-world material variability. He recalibrated his fatigue analysis using the nuanced values she pointed to. The math didn't just work; it sang.

Arjun blinked. He turned to 158. There, tucked into the crease of the binding, was a small, yellowed photograph of a young woman in a 1970s sari, holding a slide rule. On the back, it simply said: “For the next one who gets stuck. Science is logic, but engineering is intuition. — Meera, '74.”