Saroo Brierley was five years old when he fell asleep on a train in India with his brother - and awoke totally alone.
Lost and afraid, the little Indian boy's tragic story had a silver lining, after he was eventually adopted by an Australian family. But while he was safe, and loved, he had lost all hope of finding - let alone contacting - his former family.
Until Google Maps. In a film made to promote Google's service, Brierley describes how he managed to use the faint memories of his home to find his way back home.
"It was a needle in a haystack, but, the needle was there."
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