Volume 589 Issue 7841



News Features

News & Views

AI weighs in on debate about universal facial expressions p.202

An analysis of more than 6 million YouTube videos finds that people around the world make similar facial expressions in similar social contexts. The study brings data science to the debate about the universality of emotion categories.

doi: 10.1038/d41586-020-03509-5

Giant photon avalanches observed in nanoparticles p.204

In some materials, the absorption of a single photon can trigger a chain reaction that produces a large burst of light. The discovery of these photon avalanches in nanostructures opens the way to imaging and sensing applications.

doi: 10.1038/d41586-020-03659-6