We track four people on their journey.
Why Iraqi refugees abandon Europe and return home
29 Apr 2011 15:16 GMT
Prince William and Kate Middleton have married at a wedding service at London(***)s Westminster Abbey [EPA}
Many royal well-wishers had camped overnight to gain a prime view for the wedding [EPA]
About 1,900 guests attended the ceremony inside the abbey [EPA]
The guests included footballer David Beckham and his wife Victoria [AFP]
Musician Elton John, left, attended the ceremony with his partner David Furnish [EPA]
Prince Harry was best man at his brother(***)s wedding [EPA]
Following the ceremony, the couple made their way to Buckingham Palace in a 1902 open-topped state landau carriage [EPA]
A large crowd outside the palace cheered as the couple took their first public kiss [EPA]
Transport apps are revolutionising commutes for the middle classes, but poorer citizens still face daily gridlock.
Poverty & Development, Asia, India
Cubans get amnesty at the US border, but reaching it involves a risky journey along the Central American migrant trail.
Human Rights, Latin America, Cuba
In many ways, Michael is just like any other 11-year-old, but he has had four open heart surgeries.
Health, US & Canada
Follow a dancer through the exhaustion and jubilation of Peru's days-long Virgin of Candelaria festival.
Arts & Culture, Latin America, Peru
We travel to Chile to meet a group of young scientists determined to develop smart plant-based food to save the planet.
Science & Technology, Chile, Food
We follow the journey of a plastic bottle to find out what it takes to truly recycle the product creating zero waste.
Science & Technology, US & Canada, Environment
A couple working to protect LA communities from gang violence is caught in the crossfire of the US war on gangs.
Politics, Gang violence, US
South Koreans drink twice as much liquor as Russians, but is this national obsession with alcohol reversible?
Health, Asia, South Korea