Dancing with the Ancients. Review of the exhibition “Hymn to Apollo: The Ancient World and the Ballets Russes” at NYU’s Institute for the Study of the Ancient World.

The number of roles in theatre plays has decreased over time. Note that cast size is different from the number of roles. Baumol cost disease is one reason for increased costs.

Time is running out for sand. Sand and gravel are being extracted faster than they can be replaced. Monitor and manage this resource globally, urge Mette Bendixen and colleagues.

How digital advertising markets really work.

The lineages of the first humans to reach northeastern Siberia and the Americas.

Exotic particles called pentaquarks may be less weird than previously thought.

Deep learning has a terrible carbon footprint. Training a single AI model can emit as much carbon as five cars in their lifetimes.

Predators affect competitors’ coexistence through fear effects.

Ancient molecules reveal surprising details on origins of ‘bizarre’ sloths.

Extremophiles and life in the most unlikely of places.

Federico Varese on Salvator Mundi and the unreality of the art market.

A Q&A with Edward O. Wilson.