Japan’s Hayabusa-2 spacecraft has arrived after more than a three year journey at the Ryugu asteroid which is just over half a mile long. It has successfully sent probes onto the surface and is sending pictures back to Earth. Gareth Mitchell discusses the achievement with BBC Science Correspondent Jonathan Amos.

A hundred years ago, the 1918 flu pandemic killed between 50 and 100 million people worldwide and infected around half a billion. Seasonal flu accounts for about 650,000 deaths per year. As this year’s flu season approaches, there are new insights into how the influenza virus causes disease and why some strains like the 1918 one (a subtype of the avian strain H1N1) are so deadly compared with the seasonal kind. In the most serious cases, there’s an extreme immune reaction in the lungs, and people can effectively suffocate. The latest research from the universities of Cambridge and Oxford has uncovered a molecule that might be behind that immune overreaction. Dr Aartjan te Velthuis explains the findings and the implications for novel treatments.

The massive bombing raids on cities in World War Two lead to terrible human tragedy, Now a historian and a physicist have been looking at how shock waves from some of the major bombing over Berlin caused the upper atmosphere above Slough to wobble. Specifically they’re interested in the layer eighty to a thousand kilometres up that reflects radio waves, the ionosphere. Historian Patrick Major and meteorology expert Christopher Scott, both professors at the University of Reading, tell Gareth about their collaboration and how monitoring changes in the ionosphere today can reveal both man made and natural explosive events.

And Adam Rutherford talks to Professor Sarah-Jayne Blakemore of UCL about her book, Inventing Ourselves: the Secret Life of the Teenage Brain, the last on this year's shortlist for the Royal Society Insight Investment Science Book Prize.