Editor's note

The last decade saw remarkable development in the technology and methods used to understand ancient human DNA. These approaches offer exciting new ways to explore human origins and, writes Marlize Lombard, were put to fascinating use on remains from two South African sites. The result? Researchers have recalculated the time at which humans like us first split from archaic or pre-modern human groups to between 350 000 and 260 000 years ago.

It’s been 24 years since Cambodia’s first modern-era elections. And, reports Rhona Smith, the political landscape is troubling ahead of next year’s scheduled polls: the country is on the brink of becoming a one-party state.

For decades, officials in Puerto Rico have tried to brand the country to attract outsiders and prospective investors. Now, as the island reels in the wake of Hurricane Maria, Carlos A Suárez Carrasquillo examines why aggressive marketing has done more harm than good.

Natasha Joseph

Africa Science and Technology editor

Top story

Tapping into ancient DNA can help us understand ancient humans’ movements and lives. Illustration: Marlize Lombard, Maryna Steyn and Anders Högberg

Ancient DNA increases the genetic time depth of modern humans

Marlize Lombard, University of Johannesburg

Archaeology is not only about stones and bones: it is mainly about the people of the past. DNA is one way to get from the stones and the bones to the people and their stories.

Politics + Society

Cambodia heads towards one-party state – and a democratic crisis

Rhona Smith, Newcastle University

Dark days lie ahead as democracy is dismantled.

Marketing a devastated Puerto Rico should not be the priority

Carlos A Suárez Carrasquillo, University of Florida

Puerto Rico has focused significant efforts on branding – but at what cost?

In Mexico, undocumented migrants risk deportation to aid earthquake victims

Luis Gómez Romero, University of Wollongong

A brigade of migrants from Honduras, El Salvador, Nicaragua and Guatemala have interrupted their trek north to stay in Mexico and support earthquake recovery efforts.

Black Lives Matter is a revolutionary peace movement

Melina Abdullah, California State University, Los Angeles

The peace and justice Black Lives Matter seeks require a fundamental transformation of a system that preys on and benefits from Black suffering.

Health + Medicine

Science + Technology