Geoff Mosley, the former director of the Australian Conservation Foundation, is one of the most significant figures of the environment movement in Australia. World heritage status of the Great Barrier Reef, recognition of the Alpine National Parks, preservation of Fraser Island - his achievements are many. And on Big Ideas he reflects on the history of conservation in Australia.

Could the most like form of extra-terrestrial life be a fish? Water has a crucial role in the development of life

Dr Lobsang Sangay, President of the Central Tibetan Administration, speaks about his vision and hopes for Tibet, and the challenges facing his country.

Who votes for One Nation and why?

We look at robots as friend and foe. Designers are getting better at creating life-like robots who are more responsive to our social and emotional needs. They're already able to perform many tasks but can they ever take the place of human companions? At the other end of the scale, military robots are replacing humans on the battlefield as clinical killing machines.

Can robots give us the love and friendship we need?

Should robots be making life and death decisions on the battlefield?

The same science that’s so promising in fighting deadly diseases will cause a nightmare for anti-doping organisations.

Australia is a nation shaped by immigration. From the first fleet onwards, people from all over the world have arrived here and made a new life for themselves, and their families. In the post war, ‘populate or perish’, era, migrants came from Italy, Greece, and other parts of Europe. Then, following the Vietnam War, Asian immigration dramatically increased. Modern Australia is a multicultural country. Paul Barclay speaks with a panel of guests about the impact of immigration on Australia.

Business with a social purpose tackles inequality.