The billionaire investor has dumped groceries in favour of tech and airline stocks.
Academics are trained to answer important questions about health policy, and collaborating with industry on research can have a big impact.
Companies, which in the past tended to stay neutral on divisive social and political issues, are increasingly taking a stand. What's behind the change?
The food on our tables is central to the #COP21 debate and any Paris agreement must help build a system that moves us a long way from our current habits.