Johann Hari explains the health risks and rewards of the new weight loss drugs and looks at the causes of the high demand for these drugs in the affluent west. Brendan Kennedy argues for water rights for native title owners in the Murray Darling Basin.

Bruce Shapiro reports on the latest from the student protests at Columbia University and Satyajit Das shares the conflicting emotions he feels about the amazing wildlife he has seen on his travels and his concerns for their future.