Communications of the ACM

The Communications Web site, http://cacm.acm.org, features more than a dozen bloggers in the BLOG@CACM community. In each issue of Communications, we'll publish selected posts or excerpts.

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Three breakthrough experiments involving photons have extended coherence times and indicated scalable production.

Drilling down to more detail on a computer screen, or moving out to see the context, is basic. But it's hardly simple and, after 20 years, innovations are still occurring.

As college tuitions soar, various online models vie to educate college students worldwide---at no cost.

New ways to develop technologies for the emerging growth markets.

Reflections on the legalities and economics of preserving animations and games in Europe.

The bytes you save today may bite you tomorrow.

Recognizing and working with moods---your own, your team's, and your customers'---is essential to professional success.

A proposal for an international group focused on broadening participation.

A unique firsthand account of formative experiences with Alan Turing.

A thinking framework in the form of an actionable kernel.

A proposal to improve the performance and availability of streaming video and other time-sensitive media.

While the ubiquitous SSD shares many features with the hard-disk drive, under the surface they are completely different.

Improved performance and a proven deployment strategy make SPDY a potential successor to HTTP.

Computers interacting with, not imitating, humans is the way forward.

The challenge of programming molecules to manipulate themselves.

We consider the problem of specifying combinations of data structures with complex sharing in a manner that is declarative and results in provably correct code. In our approach, abstract data types are specified using relational algebra and functional ...

Algorithms offer a rich, expressive language for modelers of biological and social systems. They lay the grounds for numerical simulations and, crucially, provide a powerful framework for their analysis. The new area of natural algorithms may reprise in ...

Last month (November 2012) we posted a trio of brainteasers concerning the use of a balance scale to determine the weight of various numbers of coins. Here, we offer solutions to all three. How did you do?

Sanjeev Arora talks about proof, intractability, and finding the best way to approximate problems.