Sitting on his father’s shoulders, two-year-old Rahul Kumar giggles and tugs on a lock of his father’s hair. A happy, healthy-looking boy, Rahul has already seen much of India. Born in a small village in northern Bihar, he has spent roughly half of his short life in Punjab, where his parents work as seasonal farm labourers. He has spent a few months in his parents’ village. The rest has been spent...

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