Guest: Dayu Lin, Neuroscientist and Professor of Psychiatry, Neuroscience and Physiology at the New York University Grossman School of Medicine.

Guests:

• Dr Laura Hayes, Solar Physicist.

• Don Ross, Professor of Philosophy and Behavioural Economist.

Guest: Professor Giles Yeo

Guests: 

• Dr Lucy Hawkes

• Dr Ruth Freeman

• Dr Laura Dungan

Guest: Joshua Howgego, author of 'The Meteorite Hunters'

Guests:

• Dr Ruth Freeman.

• Dr Laura Dungan.

• Associate Professor in Applied BiosSciences at Macquarie University, Maciej Maselko.

Guest: Professor Andrew Daly, Associate Professor in Biomedical Engineering at the University of Galway.

Guest: Prof Geraint Tarling of the British Antarctic Survey.

Also Newsround with Shane Bergin and Ruth Freeman.

Guest: Dr Gerard McCarthy, Oceanographer with ICARUS Climate Research Centre and Department of Geography.

Guest: Antonio Fernando Ruiz, Assistant Professor and Meinig Family Investigator in the Life Sciences at Cornell University.