Category Archives: epistemology

Open Access

My article for the Berkeley Science Review on Open Access is out, and it is available here (for free, of course!): Science to the people.

“Astronomers and physicists have been sharing pre-prints since before the web existed,” says Alberto Pepe, founder of the authoring and pre-printing platform Authorea. “Pre-prints are an effective (and fully legal) way to make open access a reality in all scholarly fields.” Within hours, articles are available online, and scientists can interact with the author, leaving comments and feedback. Importantly, submission, storage, and access are all free. The pre-printing model ensures that an author’s work is visible and properly indexed by a number of tools, such as Google Scholar.

Special thanks to Rachael Samberg from thee UC Library and Alberto Pepe from Authorea.

Things seems to change quickly in that field, thanks to institutional efforts:

Here’s a list of resources that I’ve compiled from the talk by Laurence Bianchini from MyScienceWork when I invited at LBL, and a piece written by Nils Zimmerman on Open Access at LBNL: Open Access publishing at Berkeley Lab.


Living in the Bay Area has a lots of perks, notably the climate and the people who live here– some are driven, and some maybe too much.

The Silicon Valley became fertile and successful when entrepreneurs started bringing hardcore scientific advances to the masses, with companies such as Fairchild Semiconductors, or innovative technologies, with companies such as Xerox and its Palo Alto Research Center.

Nowadays, the silicon in the valley is mostly gone (I often joke that among my friends living in the Silicon Valley, I am the only one actually working on silicon… yet I don’t live in the valley:), and tech companies that have nothing to do with actual τέχνη. Yet the dreams of technology to save us all are still pretty alive. But it seems that it all has to do with hubris, or PR at best, and it is hurting actual science and those who make it.

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Information in optics

Dear reader,

I’ve compiled here, just for you, three old article that I’ve OCRed and revamped a little bit. They are article with a lot of style and insight, that people sometimes cite without ever reading them… mostly because they’re not readily available. That’s the silly situation I wanted to fix.
– Enjoy !

Zernike – Physica IX, no 7 (1942)
Phase Contrast, A New Method for the Microscopic Observation of Transparent Object

Gerchberg and Saxton – Optik Vol. 35, No.2 (1972)
A Practical Algorithm for the Determination of Phase from Image and Diffraction Plane Pictures

Gabor – Progress in Optics Vol. 1 (1951)
Light and information” (still under revision)

Here’s a blissful excerpt from Gabor’s piece :

Light is our most powerful source of information on the physical world. Anthropologists have often emphasized that the privileged position of Man is due as much to his exceptionally perfect eye, as to his large brain. I was much impressed by a remark of Aldous Huxley, that we owe our civilization largely to the fact that vision is an objective sense. An animal with an olfactory sense or with hearing, however well developed, could never have created science. A smell is either good or bad, and even hearing is never entirely neutral; music can convey emotions with an immediateness of which the sober visual arts are incapable. No wonder that the very word “objective” has been appropriated by optics. But on the other hand it is probably the peculiar character of vision which is chiefly responsible for one of the most deep-rooted of scientific prejudices; that the world can be divided into an outer world and into an “objective” observer, who observes “what there is”, without influencing the phenomena in the slightest.

Tukey – Annals of Statistical Mathematics
The future of data analysis” (1961) — still working on it

Zernike – Physica I, pp. 689-704 (1932)
Diffraction theory of the knife-edge test and its improved form“,
translation by Anthony Yen (who went all in by redrawing all the figures !)


A gedankenexperiment by Gabor, to discuss the nature of information contained in light


— Thanks to Martin Burkhardt for sharing some of these pieces !

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Love and Confidence in science

Recent events in the scienfic community – I’m thinking of the detection of primordial B-mode signal in the CMB polarization by BICEP2 (probable), the discovery of Higgs Boson (Nobel-prized) and of the faster-than-light neutrinos (ruled out as an experimental error) – invite us to draw a line between what is reasonable science and what is not.

Saul Perlmutter talking about exotic theories in astrophysics

Saul Perlmutter talking about exotic theories in astrophysics

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La deraisonnable efficacité des mathématiques

Hi peeps !

Dear English-speaking readers :
this post is about a French translation of Hamming’s
The Unreasonable Effectiveness of Mathematics
You can readily enjoy this text in English language!
C’est un texte que j’affectionne et qui reprend le question thème épistémologique abordé par Eugene Wigner dans “The Unreasonable Effectiveness of Mathematics in the Natural Sciences” (dont la traduction par mes soins est en cours)
Voici un extrait du texte :
C’est ainsi qu’il y a des odeurs que les chiens peuvent sentir et que nous ne pouvons sentir, des sons que les chiens peuvent entendre et que nous ne pouvons entendre, et encore des couleurs que nous nous ne pouvons voir et de saveurs dont nous ne pouvons nous délecter.
Des lors pourquoi, compte tenu de la façon dont nos cerveaux sont câblés, la remarque “Peut-être y a-t-il des pensées que nous ne pouvons pas concevoir” vous surprendrait-elle ? L’évolution, jusqu’à présent, pourrait nous avoir empêché de penser suivant certaines directions ; il se pourrait qu’il y ait des pensées impensables.
N’hesitez pas me faire part de vos commentaire, quand aux erreurs de typo éventuelles ou sur des problèmes de style.
Si le coeur vous en dit, vous pouvez faire un tour sur la partie “traduction” du blog pour retrouver d’autres textes  (dans le même esprit, vous trouverez “La relativite du faux” de Isaac Asimov)
Enjoy !
Principia Mathematica (theorem 54)

Pas si efficaces, les mathématiques…. Démonstration en logique formelle de “1+1=2” par Russell.


MOOCs are a hoax

…said Dev Patnaik at Uncharted, and I believe he is probably right.

Big institutions (elite schools) have no idea how to deal with PR,  so MOOCs is a good way to increase their influence : it matters for the teachers only.
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Hook theory

I want to talk today about Hooktheory, a website/ebook that two of my colleagues at CXRO Chris and Ryan have founded and are currently developing.

They gave me the chance to visit the Berkeley Skydeck, a startup incubator where they share space with other innovative companies on the top floor of the Chase building, in Berkeley– a great view !

Berkeley Skydeck West

West view from the Berkeley Skydeck– located on the top floor of the Chase Building in Berkeley

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Variations sur les droits de l’homme et du citoyen

En ligne avec le prédent post, je voulais vous faire part d’un élément étrange des droits de l’homme.

En lisant “I have a dream” de Martin Luther King Jr, il fait référence a l’élément suivant :

we hold these truths to be self-evident that all men are created equal

qui est un extrait fameux de la constitution americaine.

Tentant de traduire cela en francais, j’ai comme eu l’impression qu’il manquait un mot…

Article 1er de la declaration de droits de l’homme et du citoyen (1789)

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La relativité du faux

english readers : this post is a translation of I. Asimov’s essay “The relativity of wrong”, which can be found here.

Continuons dans la lancée :

A couple of months in the laboratory can save a couple of hours in the library – Frank H. Westheimer

et présentons aujourd’hui la traduction du texte de Isaac Asimov, paru dans le Skeptical Inquirer durant l’automne 89. Il est disponible en version html.

(Pour compléter, je vous invite à lire “The Unreasonnable effectiveness of mathematics” de R. Hamming (en anglais; je n’ai pas encore trouvé la force de la traduire)

La relativité du faux

Par Isaac Asimov

The Skeptical Inquirer, vol. 14, No. 1, pp. 35-44, Automne 1989
traduction par Antoine Wojdyla

L’autre jour m’est parvenue une lettre. Elle était écrite à la main de façon grossière et difficile à lire par conséquent. Mais j’ai tout de même essayé de la déchiffrer, juste au cas où il y aurait écrit quelque chose d’important. Dans la première phrase, celui qui m’écrivait me disait qu’il avait fait des études de littérature, mais qu’il avait ressenti le besoin de m’enseigner les science (je soupirai, car je ne connaissais que très peu de littéraires suffisamment armés pour m’apprendre des choses scientifiques; mais je suis tout à fait conscient de l’immense étendue de mon ignorance, et je suis prêt à en apprendre autant que je peux de tout le monde, de sorte que je décidai de poursuivre ma lecture.)

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Perceptive hash

Continuing with metrics…

Everybody can easily recognize a tune, a famous painting or the face of a friend. Not so for a computer, who must first digitize the information, and operate on this dataset to find similarities. Back in the beginning of computer era, people though that it would be easy to recognize characters or voice, but technology had hard time with these issues. OCR is still perfectible, while voice recognition is still not common (things are getting better, but Siri is still fallible)

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