Lost at age 5, with no place names, but only visual memory, a man, 25 years later, uses Google Earth to find his way back to his mother.

This is an amazing story!

"It was just like being Superman. You are able to go over and take a photo mentally and ask, 'Does this match?' And when you say, 'No', you keep on going and going and going."

Eventually Saroo hit on a more effective strategy. "I multiplied the time I was on the train, about 14 hours, with the speed of Indian trains and I came up with a rough distance, about 1,200km."

He drew a circle on a map with its centre in Calcutta, with its radius about the distance he thought he had travelled. Incredibly, he soon discovered what he was looking for: Khandwa. "When I found it, I zoomed down and bang, it just came up. I navigated it all the way from the waterfall where I used to play."