Four Thought episodes available now on BBC iPlayer

Martin Cassini argues that the UK system for managing traffic needs radical reform.

Matthew Syed says the importance of talent over effort should not be overemphasised.

Clare Melford explains what she believes business leaders can learn from Buddhism.

Prof June Andrews argues for a revolution in the approach to dealing with dementia.

Jules Evans explores what ancient philosophy can tell modern society about well-being.

Bobby Cummines, chief executive of UNLOCK, says ex-offenders need jobs to reduce crime.

Rob Hopkins argues for a new approach to energy, society and our surroundings.

Gordon Bridger argues that we should change the way in which we spend overseas aid.

Gerard Darby argues that the education system is damaging creativity.

Clare Allan asks why lying gets such a bad press.

Judith Clegg argues that start-up culture can make the world a dramatically better place.

Paul Flatters argues that childhood today is better than ever before.

Tim Smit argues that if we learn to trust one another, Britain could be great again.

James Lange argues that YouTube videos can be a vital tool for sociology - and science.

Author Anthony McGowan thinks we should see ourselves as villains, not heroes.

Physics teacher David Perks says current science teaching is short-changing children.

Science writer Angela Saini celebrates being a late adopter of new technology.

David Bainbridge sees the evolution of middle age as central to our species' success.

James Daunt argues libraries and bookshops should be vital social and cultural spaces.

Aza Raskin proposes a design renaissance in healthcare.

Dreda Say Mitchell says we have overlooked the cultural element to social mobility.

Christie Watson asks if there are some things worse than death for some very ill children.

Ed Yong explores the implications of being host to billions of microbes.

Kate Fox argues we need to re-learn what we think we know about the effects of alcohol.

Cindy Gallop discusses embracing zero privacy.

Matthew Goodwin argues the well of potential support for the far right in Britain is deep.

Russell M Davies says the next revolution will unleash individual creativity.

Professor Charles Ffrench Constant speaks on "Regenerating the human body.".

Nature writer Jim Crumley asks if it is time to reintroduce wolves to the UK.