How did Isabel dos Santos become Africa's richest woman?

Dos Santos, the billionaire daughter of the former president of Angola, claims to be a self-made businesswoman, but the Luanda Leaks, a cache of 715,000 emails, charts, contracts, audits and accounts, help explain how she actually built her business empire. Plus, why are the world’s oldest trees dying?. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>