Assistive robots can act as companions and coaches to young and old alike, from autistic children to stroke survivors. Eighteen-year-old Saliha, from Bangladesh, talks to Professor Maja Mataric, from the University of Southern California, about why she is convinced technology can be a force for good. #WorldWiseWeb

Producer: Tamsin Barber.

World Wise Web is a co-production between BBC World Service and BBC Rewind.

Music composed by Nick Thorburn

Archive: Robot archive is from the USC Viterbi School of Engineering.

The breakthrough design of the iPod - a portable music player that made the CDs and cassette tapes that had gone before redundant - totally changed our listening habits. Tony Fadell is its inventor. Speaking to 17-year-old budding designer Anna Zanelli in London, he explains how his love of DJing inspired his iconic creation. And, he tells her, the design would go on to transform how we talk to each other, with the launch of the iPhone. #WorldWiseWeb

Producer: Tamsin Barber

World Wise Web is a co-production between BBC World Service and BBC Rewind. bbc.co.uk/archive

From GPS to Google search, meet the innovators and engineers who shape our digital world. Teenagers from around the globe talk to the tech pioneers who have changed our lives.