Sam Fenwick dives deep into the philanthropic world - and how it's changing - amid the news that Melinda Gates is leaving the Gates Foundation. Why has she made the decision? And what's next for this philanthropic giant?

Elsewhere, we explore the resurgence of "meme stocks", the science behind work rituals, and what to expect from the Australian budget

(Photo: Polio vaccination campaign in Pakistan, Peshawar, where the Bill and Melinda Gates Foundation have worked. Credit: EPA-EFE/REX/Shutterstock)