How cheaply can you build a supercomputer?  A group from the University of Southampton just made one using 64 Raspberry Pi ARM GNU/Linux boxes ($25 each) and Lego blocks. The machine, named "Iridis-Pi" after the University's Iridis supercomputer, runs off a single 13 Amp mains socket and uses MPI (Message Passing Interface) to communicate between nodes using Ethernet.

The team was led by Professor Simon Cox and included Richard Boardman, Andy Everett, Steven Johnston, Gereon Kaiping, Neil O'Brien, Mark Scott and Oz Parchment.  Professor Cox's son, six-year-old James Cox, assisted with specialist support on Lego and system testing.

A set of fossil footprints in Joggins, Nova Scotia have been identified as the world’s smallest - among vertebrates to-date, anyway.

The footprints were found at Joggins Fossil Cliffs. A fossil specimen of the ichnogenus Batrachichnus salamandroides was collected by local amateur paleontologist Gloria Melanson, daughter of Don Reid, the famed Keeper of the Joggins Cliffs, while walking the Joggins beach. Joggins Fossil Cliffs is a UNESCO World Heritage Site.

It sometimes happens that my comments in the threads of my own blog get long and detailed (do not take this as me boasting about anything - it is just a fact). When that happens, I reason that they deserve to be promoted to a post by themselves, because threads are read by way fewer readers, and some of them might thus lose some interesting bit.

Because of the above I am (re)posting the text below, which explains some "a priori" reasons why quarks come with fractional electric charges in multiples of one third, why the sum of charges of fermions in one family nullify, and why our universe chose to have quarks of three colours. Beware, some non-trivial concepts of quantum field theory are needed, but I will try to make this as painless as possible (but not more).

When Western scrub jays summon others to screech over the body of a dead jay, they come a'runnin', and those 'funerals' can last for up to half an hour.

But why? Western scrub jays live in breeding pairs and are not particularly social birds. “They’re really territorial and not at all friendly with other scrub-jays,”  said Teresa Iglesias, a U.C. Davis graduate student and co-author of a new study in Animal Behaviour. It turns out that death seems to signify danger, which opens up an even odder set of questions.

Researchers have discovered how to store diverse forms of artificial short-term memories - in isolated brain tissue.

Memories are often grouped into two categories: declarative memory, the short and long-term storage of facts like names, places and events; and implicit memory, the type of memory used to learn a skill like playing the piano.  In the study, researchers sought to better understand the mechanisms underlying short-term declarative memories such as remembering a phone number or email address someone has just shared. 

Last Saturday night Gian Francesco Giudice and I discussed the discovery of the Higgs boson and its aftermath in front of a wide audience gathered in the Aula Magna of Mantova University.

The event was #173 in the wide program of the town's literature festival, a week of seminars, interviews, performances by authors of books, journalists, and intellectuals in a broader sense.

Last week, a meta-analysis from a highly credible academic source (Stanford University, its medical school and nearby institutions), raised serious questions about the often-touted nutritional advantage of organic food.  They digested the contents of 237 peer reviewed articles comparing organic and conventional foods and diets.  They concluded that "the published literature lacks strong evidence that organic foods are significantly more nutritious than conventional foods."  

Fifty years ago, marine biologist Rachel Carson ignited the modern environmental movement with the publication of Silent Spring. It was an ecological alarm call – an attack on what she believed was the overuse of pesticides and the potential harm they might cause to humans and wildlife – and a call for a progressive, science-focused view of modern agriculture and food.

Her deeper, ecological message is often overlooked by her most ardent supporters. It should be front and center as Californians prepare to go the polls in November to decide the fate of Proposition 37 – which could introduce mandatory labeling of genetically modified (GM) foods into the United States for the first time.

We are in a new space revolution, and in the past two years, several people have used the Kickstarter crowd-funding platform  to try to get into space.  Not all succeeded.  Let's look at the current standings.  They are, in order of kickstarter: Team Prometheus, Project Calliope, Sampling Space, KickSat, ArduSat, and most recently SkyCube.

It would be idiotic to claim that quantum mechanics just follows from getting stoned and blurting “everything is possible”. One of the difficulties with understanding the derivation of quantum mechanics (QM) from tautological modal realism [1] is that vital steps are omitted from the discussion (see for example many comments here). An important early step is grasping the indeterminism contained in tautological modal realism (TMR). Before discussing indeterminism, let us briefly see where indeterminism is in the bigger picture. The derivation of QM looks as follows [numbers like (3) refer to numbered paragraphs in [1] ].