Dr Len Fisher
Physicist and writer Dr Len Fisher is a visiting fellow in physics at the University of Bristol in the UK.
Bettina Arndt and Linda Jaivin
Bettina Arndt and Linda Jaivin discussed the female libido with Richard in 'Not Tonight Honey' at this year's Brisbane Writers' Festival
John Rendall and 'Ace' Bourke
John and Ace fell in love with a lion cub - in Harrods department store in London.
Bernadette O'Shea and Ash Abdollahi
Ash Abdollahi is studying veterinary science and is also a competitive body builder. Bernadette O'Shea believes champagne makes the soul sing.
Tony Cochrane
Tony Cochrane is the man who has reinvented motor sport in Australia, as the Chairman of V8 Supercars.
John Eales
Former Wallabies captain John Eales is one of the most respected figures in the game of rugby.
Alex MIller
Alex Miller is one of Australia's finest writers, and one of the longest in the making.
Angus Emmott
Grazier, naturalist, photographer Angus Emmott has lived his whole life on Noonbah station in far south-western Queensland.
Robert Forster
Musician and writer Robert Forster has put together a list of ten essential rock and roll rules, plus the ten bands he wishes he'd been in.
Alison
Alison still prefers to be known only by her first name after surviving a vicious attack some years ago.
Bernie Hobbs
Bernie Hobbs is well-known for her regular science reports on ABC Radio and as a regular judge on the 'New Inventors'.
Gerard Ryle
Gerard Ryle is one of Australia's most brilliant investigative journalists.
Dr David Ward
Dr David Ward works as an emergency services consultant in a public hospital, and is also a lieutenant colonel in the Army Reserve.
Peter Grose
Peter Grose has been completely absorbed in what happened on that day in Darwin for several years.
Sebastien and Sayo Lipman
Sabastien and Sayo Lipman were raised on different continents, and in very different families.
Gary McKay
Vietnam veteran Gary McKay is one of Australian's foremost oral historians.
Actor Noeline Brown
Noeline Brown is a celebrated Australian actor, renowned for her roles in the Mavis Bramston Show, The Naked Vicar and Blankety Blanks. Noeline describes herself as an "accidental actor", one without any formal training for the job, but clearly one with plenty of talent for it's given her a career spanning five decades. Noeline grew up in inner city Sydney and she told Richard Fidler her childhood days were filled with trips to the Art Gallery, the Mitchell Library, the Museum of Applied...
Professor Mac Christie and Annabel Crabb
Professor Mac Christie is one of the leading scientists working on the science of drug addiction and chronic pain. Annabel Crabb has a good ear for the absurdities and bluster in federal parliament.
Ray Martin
Ray Martin has been appearing in Australian living rooms for four decades now.
Dr Norman Doidge
It used to be thought that the brain was like a mechanism, and if one part broke, then that bit simply wouldn't work any more.
Debby Cox
Debby Cox was a zoo keeper at Taronga Zoo, and is now one of the world's foremost experts on the handling, care and conservation of chimpanzees.
Tamara Davis
Tamara Davis is something of a science superhero, and she's in the search of dark energy.
Professor Graham Martin OAM
Professor Graham Martin OAM is director of the Centre for Suicide Prevention Studies at the University of Queensland.
George Friedman
George Friedman is a political scientist, strategic thinker and futurist.
Stephen Page in conversation
Stephen Page is Artistic Director and Choreographer of Sydney-based Bangarra Dance Theatre - this year celebrating their 20th anniversary.
Barry Humphries
Barry Humphries and Dame Edna have been part of our lives for five decades.
Gary Stone
Deacon Gary Stone served as a senior officer in the Australian Army, and is now a military chaplain on call to travel to scenes of devastation anywhere in the world.
Richard Glover
Richard Glover and his friend Phillip Clarke spent ten years building a house out of mud bricks.
Lynne Tietzel
Lynne Tietzel knows her cheeses, particularly those made by small producers dotted around Australia.
Stephanie Alexander
Chef and food writer Stephanie Alexander believes good food is so much more than something nice on a plate.