Presenter Isy Suttie talks to Oxford University students Alex and Martha, who turned their love of literature into a charity where books are donated to homeless people.

Alex and Martha were shocked at the contrast of university life compared to those sleeping rough in the city and wanted to do something to help. They started their journey entirely through social media and word of mouth, getting local students and colleges involved who would donate the books and make sure they reached the people who would welcome them for much-needed entertainment and respite.

Now Alex and Martha are looking at growing their charity, teaming up with local organisations in the hope of creating a mobile library to get more people involved with the work they do.

This is how Alex and Martha are changing the world…