A 4-year-old boy has memorised virtually every bus service in the capital.
Ishaal Yewale can tell you which bus route to take, day or night.
His father Jayant says that Ishaal's always been fascinated with public transport and has been reading bus maps for the past eight months. 'He can read well, and is very good with numbers'.
'I love buses,' said Ishaan of Lewisham, south-east London. 'I spend all day looking at buses. I read two maps a day.'
His parents have no idea why their son is so interested in public transport.
'It's a mystery to us,' said his 36-year-old father, Jayant.
'He just loves them. My job involves travelling around a lot and whenever I come back he asks me what buses or trains I took.'
Ishaan in action , watch the video @ BBC