> ## Content Index
> Fetch the complete content index at: https://www.ivarhagendoorn.com/llms.txt
> Use this file to discover other available public pages before exploring further.

# Further Reading
- URL: https://www.ivarhagendoorn.com/blog/2019/07/28/further-reading-67/
- Published: 2019-07-28T07:35:00.000Z
- Updated: 2019-09-22T07:57:54.000Z
- Description: Dancing with the ancients. The number of roles in theatre plays has decreased over time. How digital advertising markets really work. Time is running out for sand. Deep learning has a terrible carbon footprint. The first humans to reach the Americas. Pentaquarks. Extremophiles. Sloths. And more.
- Author: Ivar Hagendoorn
- Tags: Blog, Further Reading

[Dancing with the Ancients](https://www.nybooks.com/daily/2019/07/20/dancing-with-the-ancients/?ref=ivarhagendoorn.com). 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](https://www.sciencedirect.com/science/article/abs/pii/S0362331919300655?ref=ivarhagendoorn.com). 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](https://www.nature.com/articles/d41586-019-02042-4?ref=ivarhagendoorn.com). 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](https://prospect.org/article/how-digital-advertising-markets-really-work?ref=ivarhagendoorn.com).

The [lineages of the first humans](https://www.nature.com/articles/d41586-019-01374-5?ref=ivarhagendoorn.com) to reach northeastern Siberia and the Americas.

Exotic particles called [pentaquarks](https://www.sciencemag.org/news/2019/06/exotic-particles-called-pentaquarks-may-be-less-weird-previously-thought?ref=ivarhagendoorn.com) may be less weird than previously thought.

[Deep learning has a terrible carbon footprint](https://www.technologyreview.com/s/613630/training-a-single-ai-model-can-emit-as-much-carbon-as-five-cars-in-their-lifetimes/?ref=ivarhagendoorn.com). Training a single AI model can emit as much carbon as five cars in their lifetimes.

Predators affect competitors’ coexistence through [fear effects](https://www.nature.com/articles/d41586-019-01712-7?ref=ivarhagendoorn.com).

Ancient molecules reveal [surprising details](https://www.sciencemag.org/news/2019/06/ancient-molecules-reveal-surprising-details-origins-bizarre-sloths?ref=ivarhagendoorn.com) on origins of ‘bizarre’ sloths.

[Extremophiles](https://aeon.co/essays/extremophiles-and-life-in-the-most-unlikely-of-places?ref=ivarhagendoorn.com) and life in the most unlikely of places.

Federico Varese on *Salvator Mundi* and [the unreality of the art market](https://www.the-tls.co.uk/articles/public/salvator-mundi-da-vinci-art/?ref=ivarhagendoorn.com).

A [Q&A](https://www.quantamagazine.org/edward-o-wilson-finds-hope-in-selfless-ants-and-ecology-studies-20190515/?ref=ivarhagendoorn.com) with Edward O. Wilson.