Illegal gold miners have allegedly massacred ten members of an “uncontacted” tribe in a remote region of the Amazon. Brazilian authorities are still investigating. What actually happened in the Vale do Javari remains unclear but, as Holly Eva Ryan writes, a decade on from a UN declaration that was supposed to protect the rights of indigenous people they remain among the world’s most vulnerable human beings.

The scourge of a trade in the body parts of people with albinism remains a major problem in a number of countries in sub-Saharan Africa. The issue is being addressed at a United Nations expert meeting that begins tomorrow. Charlotte Baker explains why much clearer and more proactive national policies are needed, and how governments can do more to educate communities and demystify the genetic condition.

Megacities and other very large cities across the globe have become synonymous with economic growth. Some 600 are responsible for 60% of total global GDP. But, as Vincent Mack and Christopher Lim write, technological changes in manufacturing, commerce and professional services now threaten to upend the business models of the cities, from Tianjin and São Paulo to New York and Tokyo - shifts that may well turn megacities’ massive populations into a social liability rather than an economic strength.