Science | Chris Aldrich

📺 A Universal Theory of Life: Math, Art & Information by Sara Walker

Watched A Universal Theory of Life: Math, Art & Information from TEDxASU

Dr. Walker introduces the concept of information, then proposes that information may be a necessity for biological complexity in this thought-provoking talk on the origins of life. Sara is a theoretical physicist and astrobiologist, researching the origins and nature of life. She is particularly interested in addressing the question of whether or not “other laws of physics” might govern life, as first posed by Erwin Schrodinger in his famous book What is life?. She is currently an Assistant Professor in the School of Earth and Space Exploration and Beyond Center for Fundamental Concepts in Science at Arizona State University. She is also Fellow of the ASU -Santa Fe Institute Center for Biosocial Complex Systems, Founder of the astrobiology-themed social website SAGANet.org, and is a member of the Board of Directors of Blue Marble Space. She is active in public engagement in science, with recent appearances on “Through the Wormhole” and NPR’s Science Friday.

https://www.youtube.com/watch?v=kXnt79JhrbY

Admittedly, she only had a few short minutes, but it would have been nice if she’d started out with a precise definition of information. I suspect the majority of her audience didn’t know the definition with which she’s working and it would have helped focus the talk.

Her description of Speigelman’s Monster was relatively interesting and not very often seen in much of the literature that covers these areas.

I wouldn’t rate this very highly as a TED Talk as it wasn’t as condensed and simplistic as most, nor was it as hyper-focused, but then again condensing this area into 11 minutes is far from simple task. I do love that she’s excited enough about the topic that she almost sounds a little out of breath towards the end.

There’s an excellent Eddington quote I’ve mentioned before that would have been apropos to have opened up her presentation that might have brought things into higher relief given her talk title:

Suppose that we were asked to arrange the following in two categories–

distance, mass, electric force, entropy, beauty, melody.

I think there are the strongest grounds for placing entropy alongside beauty and melody and not with the first three.

Sir Arthur Stanley Eddington, OM, FRS (1882-1944), a British astronomer, physicist, and mathematician
in The Nature of the Physical World, 1927

🔖 Can entropy be defined for and the Second Law applied to the entire universe? by Arieh Ben-Naim | Arxiv

Bookmarked Can entropy be defined for and the Second Law applied to the entire universe? (arXiv)

This article provides answers to the two questions posed in the title. It is argued that, contrary to many statements made in the literature, neither entropy, nor the Second Law may be used for the entire universe. The origin of this misuse of entropy and the second law may be traced back to Clausius himself. More resent (erroneous) justification is also discussed.

🔖 The hidden simplicity of biology by Paul C W Davies and Sara Imari Walker | Reports on Progress in Physics

Bookmarked The hidden simplicity of biology (Reports on Progress in Physics)

Life is so remarkable, and so unlike any other physical system, that it is tempting to attribute special factors to it. Physics is founded on the assumption that universal laws and principles underlie all natural phenomena, but is it far from clear that there are 'laws of life' with serious descriptive or predictive power analogous to the laws of physics. Nor is there (yet) a 'theoretical biology' in the same sense as theoretical physics. Part of the obstacle in developing a universal theory of biological organization concerns the daunting complexity of living organisms. However, many attempts have been made to glimpse simplicity lurking within this complexity, and to capture this simplicity mathematically. In this paper we review a promising new line of inquiry to bring coherence and order to the realm of biology by focusing on 'information' as a unifying concept.

Downloadable free copy available on ResearchGate.

🔖 The “Hard Problem” of Life by Sara Imari Walker & Paul C.W. Davies

Bookmarked The "Hard Problem" of Life (arXiv)

Chalmer's famously identified pinpointing an explanation for our subjective experience as the "hard problem of consciousness". He argued that subjective experience constitutes a "hard problem" in the sense that its explanation will ultimately require new physical laws or principles. Here, we propose a corresponding "hard problem of life" as the problem of how `information' can affect the world. In this essay we motivate both why the problem of information as a causal agent is central to explaining life, and why it is hard - that is, why we suspect that a full resolution of the hard problem of life will, similar to as has been proposed for the hard problem of consciousness, ultimately not be reducible to known physical principles. Comments: To appear in "From Matter to Life: Information and Causality". S.I. Walker, P.C.W. Davies and G.F.R. Ellis (eds). Cambridge University Press

🔖 The Algorithmic Origins of Life – Sara Walker (SETI Talks)

Bookmarked The Algorithmic Origins of Life by Sara I. Walker (SETI Institute Talks)

The origin of life is arguably one of the greatest unanswered questions in science. A primary challenge is that without a proper definition for life -- a notoriously challenging problem in its own right -- the problem of how life began is not well posed. Here we propose that the transition from non-life to life may correspond to a fundamental shift in causal structure, where information gains direct, and context-dependent, causal efficacy over matter, a transition that may be mapped to a nontrivial distinction in how living systems process information. Dr. Walker will discuss potential measures of such a transition, which may be amenable to laboratory study, and how the proposed mechanism corresponds to the onset of the unique mode of (algorithmic) information processing characteristic of living systems.

https://youtu.be/dPiI4nYD0Vg

🔖 Origins of Life: A Problem for Physics

Bookmarked Origins of Life: A Problem for Physics by Sara I. Walker (arXiv)

The origins of life stands among the great open scientific questions of our time. While a number of proposals exist for possible starting points in the pathway from non-living to living matter, these have so far not achieved states of complexity that are anywhere near that of even the simplest living systems. A key challenge is identifying the properties of living matter that might distinguish living and non-living physical systems such that we might build new life in the lab. This review is geared towards covering major viewpoints on the origin of life for those new to the origin of life field, with a forward look towards considering what it might take for a physical theory that universally explains the phenomenon of life to arise from the seemingly disconnected array of ideas proposed thus far. The hope is that a theory akin to our other theories in fundamental physics might one day emerge to explain the phenomenon of life, and in turn finally permit solving its origins.

🔖 Linked Research at ESWC 2017

Bookmarked Linked Research at ESWC 2017

Enabling Decentralised Scholarly Communication co-located with the Extended Semantic Web Conference (ESWC 2017)

Wishing I was attending this conference which I’ve just heard about…

#eswc2017

🔖 Statistical Mechanics, Spring 2016 (Caltech, Physics 12c with videos) by John Preskill

Bookmarked Statistical Mechanics, Spring 2016 (Physics 12c) by John Preskill (Caltech)

An introductory course in statistical mechanics.

Recommended textbook Thermal Physics by Charles Kittel and Herbert Kroemer

There’s also a corresponding video lecture series available on YouTube
https://www.youtube.com/playlist?list=PL0ojjrEqIyPzgJUUW76koGcSCy6OGtDRI

🎧 What a Cool New Podcast About Shipping Can Teach You About Coffee | Bite (Mother Jones)

Listened to What a Cool New Podcast About Shipping Can Teach You About Coffee by Kiera Butler and Maddie Oatman from Bite | Mother Jones

That cuppa joe you just sipped? Its long journey to your cup was made possible by shipping containers—those rectangular metal boxes that carry everything from TVs to clothes to frozen shrimp. And there’s a whole host of characters whose lives revolve around this precious cargo: gruff captains, hearty cooks, perceptive coffee tasters, and competitive tugboat pilots. This is the world journalist Alexis Madrigal illuminates in his new podcast Containers. Alexis tells us how the fancy coffee revolution is shaking up the shipping industry, and reveals his favorite sailor snack. Bite celebrates its first birthday, and Kiera gets up-close-and-personal with a kitchen contraption that’s sweeping the nation: the InstantPot.

This is a cool new podcast I hadn’t come across before. This particular episode is a bit similar to my favorite podcast Eat This Podcast, though as a broader series it appears to focus more on culture and society rather than the more scientific areas that ETP tends to focus on, and which I prefer.

The bulk of this episode, which discusses shipping and containers (really more than food or coffee which is only a sub-topic here), reminds me of the book The Box: How the Shipping Container Made the World Smaller and the World Economy Bigger by Marc Levinson which I’d read in July/August 2014. (The book is now in its second addition with an additional chapter.) I suspect it was some of the motivating underlying material for Alexis Madrigal’s Containers podcast series.[1] The book had a lot more history and technical detail while I suspect Madrigal’s series has more of the human aspect and culture thrown in to highlight the effect of containerization. I’m subscribing to it and hope to catch it in the next few weeks. The discussion here is a quick overview of one of his episodes and it goes a long way towards humanizing the ever increasing linkages that makes the modern world possible. In particular it also attempts to put a somewhat more human face on the effects of increasing industrialization and internationalization of not only food production, but all types of manufacturing which are specifically impacting the U.S. (and other) economy and culture right now.

The InstantPot segment was interesting, particularly for cooking Indian food. I’m always intrigued by cooking methods which allow a modern home cook to better recreate the conditions of regional cuisines without the same investment in methods necessitated by the local cultures. Also following Alton Brown’s mantra, it sounds like it could be a useful multi-tasker.

h/t to Jeremy Cherfas and his excellent Huffduffer feed for uncovering this particular episode (and podcast series) for me.

References

[1]

A. Madrigal, “Containers,” Medium, 07-Mar-2017. [Online]. Available: https://medium.com/containers. [Accessed: 18-May-2017]

🔖 Proceedings of the Artificial Life Conference 2016

Bookmarked Proceedings of the Artificial Life Conference 2016 (The MIT Press)

The ALife conferences are the major meeting of the artificial life research community since 1987. For its 15th edition in 2016, it was held in Latin America for the first time, in the Mayan Riviera, Mexico, from July 4 -8. The special them of the conference: How can the synthetic study of living systems contribute to societies: scientifically, technically, and culturally? The goal of the conference theme is to better understand societies with the purpose of using this understanding for a more efficient management and development of social systems.

Free download available.