One London neighbourhood, two totally different kids.
They live streets apart but their lives have never crossed.
What happens when they have to spend a week living in one another's shoes?
In Newsround's latest special programme, Welcome to my World, 12-year-olds Sachen and Patric from Lewisham in South London are thrown into one another's hectic lives - to do each other's chores, hang out with each other's friends, and live with each other's families.
And they discover that despite coming from very different cultures, the experience teaches them valuable lessons to take back home.
How well do you know your neighbours?
We asked you how well you know the people on your street and this is what you said:
"In a small town you seem to know everyone so moving from London to a small village in Northern Ireland was different for me. I know everyone now!"
Lucy, 11, Northern Ireland
"I moved into my house a year ago this month and I still haven't got to know my neighbours. We have tried, but we failed."
Shirley, 11, Suffolk, England
"I know my neighbours quite well, some better than others. Most people will always say hello if we see each other walking down the road. The neighbours we know really well sometimes come over. I think it is good that we know our neighbours, it is more friendly that way."
Imaan, 11, London, England
"I know my neighbours very well because we live in a small estate. I have lots of friends on my estate."
Ekin, 10, London, England
"My neighbours are really nice, I know them very well."
Maya, 9, Winchester, England
"I know my neighbour REALLY well because she's my grandma."
Catlin, 11, North Yorkshire, England
"I know my neighbours extremely well because I live in a small place. I know who lives in all five houses in my cul-de-sac."
Louise, 12, Kildare, Ireland
"I don't know any of my neighbours because they don't come out very often."
Alana, 14, Oxford, England
"I know most of my neighbours who are around a lot but some of the husbands/wives I do not know. Although, I do live in an area which is quite populated."
Tom, 11, Edinburgh, Scotland
"My next door neighbours always give me a spare key if I forget mine, so I know them really well. They're not only nice people, but neighbours are very handy too!"
Georgia, 12, Essex, England
"I know my neighbours very well because we all have the same pets!"
Macey, 9, Yorkshire, England
"I know my neighbours really well because my mum is a pharmacist, my next door neighbour is a doctor and the house after that has an optician living there. And... they all work in the same place!"
Neha, 11, Bolton, England
"I know my neighbours really well because they like everything I do. We always hang out like a family!"
Olivia, 13, Lincolnshire, England
"I know the people next to me because their kids go to the same school as me. I know the people behind me because I have to keep knocking on the door because my brother kicks the ball over their fence all the time!"
Freddy, 14, England
"I don't really know my neighbours. They don't usually see us and are at work or out somewhere. I would like to know them a bit more and I hope I get to know them soon."
Lilly, 10, Lincolnshire, England
"I know my neighbours very well but that might be because I live on a tiny island, so everyone knows everyone."
Charlotte, 13, Islay, Scotland