The Observer has teamed up with NESTA, the National Endowment for Science, Technology and the Arts, to find 50 new radicals who are actively changing their communities for the better across the UK.
To find out more go to the Twitter hashtag: #50Radicals
Britain's new radicals 2014: how you can make a positive impact
In 2012, the Observer recognised 50 trailblazers who challenge the mainstream for the public good. Now, we're searching for this year's nominations, writes Yvonne Roberts
Britain's new radicals show that the best ideas can't be stifled
Geoff Mulgan
Geoff Mulgan, the chief executive of Nesta, explains why we are launching a fresh search for the country's most exciting thinkers, activists and entrepreneurs
Search is on for 50 radical ideas to transform UK
For the third year, the Observer and Nesta launched to find the top 50 people, projects and organisations offering innovative ways to tackle social challenges, writes Yvonne Roberts