Start-up companies, artists, musicians and humanitarian workers have been examining how technological innovations can improve the lives of poor and marginalized children worldwide.

They have been meeting in Helsinki, Finland, at a two-day summit organized by the government and the UN children’s fund, UNICEF, which ended on Tuesday.

Dianne Penn has been talking to Gary Stahl, UNICEF representative in Brazil, where the agency is pioneering a mobile phone alert system to help keep millions of children in school.

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