Category Archives: Science

a bad day for mice makes the future a little brighter for humans

I read an article in Nature news about about a cure for palsied mice. It brought to mind a little quote a while back that made me chuckle. A researcher was asked how she felt about how close science was to a cancer cure. She replied “If you’re a mouse with cancer… I have good news.”

Joking aside, it is a lot harder to do medical research on humans. I read the original paper that inspired the news bit and I was struck by this graph. There are 3 lines: mutant palsied mice, identical mice injected with a placebo and identical mice injected with human brain cells. The mutant mice lack a functional kind of cell that surrounds and protects the other brain cells. These glial progenitor cells become cells that produce myelin. Brains without proper myelin produce symptoms like Multiple Sclerosis. If a mouse accepts the new, human cells, the mouse recovers. So why not just skip the mice and cure people? I imagine there are a hundred good reasons, but take this graph as one example.

The fact is that that if you are a mouse with Multiple Sclerosis, I don’t have very good news. The red line is your best bet, and even there you don’t have a great chance of ending up ‘cured.’ This will take a bit of work before it’s time to try this out on people.

But it’s a good step, and that’s what it’s all about. I am really impressed with this kind of work. Look at the scale of the X axis on that graph: that’s a year of someone’s life devoted to taking care of a population of sick mice. I think this understated fact is the really amazing thing about science. It is not about a smart loner spending a few weeks in a laboratory and then fighting the ‘establishment’ for recognition. It’s about year-long endeavors that, in the end, produce one graph. That graph represents a small, hard-won step toward a loftier goal. I find it more noble to work so hard for a small, steady step than to blaze brilliantly onto the scene with claims of a scientific revolution. The fact is that most ‘scientific revolutions’ aren’t.

-Peter

Are our fates determined by our genes? I doubt it. It’s not that simple even for worms.

I have done some work with the C. Elegans model organism. They are fun little bugs, and the PETA doesn’t get all up-in-arms when you shoot their brain with a laser. Here are some fun C. Elegans Facts:

They are about 1 mm long at maturity
They are transparent
They have about 300 nerves
Their genome was sequenced in 1998
They can hunt down food on a plate
They have forms of memory and learning

Here are some things I have noticed: When illuminated with a blue laser, they panic and squirm all over the place. When you use a UV laser to blow up a portion of their outer cuitcle, they practically turn inside-out due to internal pressure. Some of the strains available through the WormBank have single nerve cells that express fluorescent protein, so that not only do their brains glow, but only the part you might be interested in glows.

Why are these critters cool? Well, despite being really small, they share a lot of biochemistry with humans. Their neurons function in the same way and the cellular processes that allow the worm to grow from an egg into a larva and from a larva into an adult are all analogous on a cellular level to changes in human development. But if you do an experiment on a worm, you can see what happens in a few days instead of months (rats) years (monkeys) or decades (humans). Also, there are some ethical constraints with humans that don’t apply to worms.

Here’s a new fact just released in Nature: they seem to have a sleep-like state. “Lethargus is a Caenorhabditis elegans sleep-like state” by Raizen et. al. “Conserved effects on sleep-like behaviour of homologous genes in C. elegans and Drosophila suggest a common genetic regulation of sleep-like states in arthropods and nematodes. Our results indicate that C. elegans is a suitable model system for the study of sleep regulation.”

They sleep, they eat, they learn (sort-of), they have lots of sex with themselves (they are hermaphrodites) and they make eggs. And they do it all in 3 days. And despite the fact that we know the fate of every cell in its body from birth to death – where it comes from, what it becomes and where it goes – we still don’t know how it manages most of its behavior.

I’d like to point out that this leaves very little hope for a reductionist perspective on psychology. We know every connection of every nerve in this worm’s body and the thing is still a mystery. I wrote a post recently about how foolish it is to make sweeping assertions about genetic differences. Just to reiterate the big upshot: even in the simplest case, our understanding of the causes-and-effects that make up psychology is limited. To think that a human being is perfectly predictable is… well… just plain dumb.

-Peter

green politics, chemistry, utopia and simplistic economics: greenwashing

Green is fashionable now, and that is great. “Green chemistry” is becoming a buzz word, and that is great, too: “green is the new nano!” Nanotechnology, as we all know, is derived from the Greek root meaning “successful grant application.”

If you asked me 10 years ago, I would have told you all about the Future when we would do away with material scarcity and people would have “enough“. I was young and naive. There is enough right now. And I’m not a communist: I don’t think the solution is taking it away from those who have in order to give to those who have not. The solution is not try to make more stuff, but to try to live a happy life. The solution is not to satisfy more wants, but to want good things. The solution is not for the rich to have less, but for people to see each others’ needs instead of their own desires. A happy culture is one that values service over material prosperity.

Where does Green fit into this? It’s hubris to think that we can grab the world by the carbon and shake the prosperity out of it. “Better living through chemistry,” is only half of the issue. We can make more stuff (e.g. chemicals, beef, plastic, homes, anything), but it has to be directed by a culture of service or it is just that: stuff. For it to be wealth, it has to represent substantive connections between people. Green can be just more stuff, or it can start to recognize the interdependent nature of the scientific game we are all playing. Our research means better living not through chemistry, but through the contribution we make to a safer, cleaner world – a goal that is only definable in terms of our connectedness to it and to each other.

The big upshot is that green is good, but look out for “greenwashing.” Greenwashing is where an organization cashes in on the Public Relations benefits of going green without making changes that reflect the rhetoric. It’s the same with the term ‘organic.’ It’s fine, but be careful that it represents what you think it represents. As Mark Bittman tells us in his TED talk while chilean farmed salmon fed organic chicken bones flown on ice in a huge freight plane from south america to your doorstep may be technically organic, it doesn’t represent the ideals. It’s elitist and unsustainable and the green sticker doesn’t change that.

-Peter

a strange document from the undusted shelves of the internet

I just read an interesting essay on the subject I discussed some time ago with a labmate: does the scientific worldview imply some kind of faith… The most I could claim was that the enterprise of science rests on the idea that there are universal and consistent laws of nature… but I was forced to concede that the practice of science does not require “faith” in universal consistency. Practicing science on a daily basis only requires that these laws appear consistent to us at any given moment.

I think that science is philosophically void if physical laws are inconsistent beyond a certain degree. Interestingly, I suppose that they could be inconsistent to a certain (calculable?) extent before it would be possible to notice. But in the extreme case that the laws of nature are totally inconsistent, the both science and philosophy are bankrupt in general. So for the purposes of any discourse, it’s sort-of a fundamental premise. Even so, it doesn’t mean you have to believe science is philosophically valid to keep doing it. It might just be fun.

At the same time, all of this got me thinking. Here’s a quote that really summed it all up: “The dominant belief in all Western Cultures is that this universe runs on material causality and is thus comprehensible to reason.” -Peter Carroll

If we don’t take some form of physical determinism as a working theory, then we might as well give up on trying to figure out how the world works by science. But I don’t know if a ‘working theory’ is the same thing as faith. Certainly it’s not the same thing as the faith some religious ‘authorities’ seem to require. That ‘faith’ is just loud, stubborn (sometimes violent) insistence. Like a little kid who says ‘Yes it is! Yes it is a million times no backsies!” Faith, right?

Well, I see a stronger faith in someone who allows honest scrutiny and change… and who makes it a working assumption that the “universe runs on material causality and is thus comprehensible to reason.” A person of faith accepts this without proof… and is willing to admit that there might not be such a thing as proof for some beliefs.

-Peter

ideas can ‘hijack’ a person’s mind and make them do things

I think that some people are uncomfortable with the memetic perspective because it presupposes that an idea can ‘hijack’ a person’s mind and make them do things. Dan Dennett speaks at length about this notion. A meme is a semi-autonomous thing: it is an idea that spreads through minds as if it had a will of its own. People don’t like to think of ideas as things that control them. For most people who think of “ideas” in the abstract, they are like items in a catalog, not programs resident in memory. A post over at meme-weaver gave me an interesting example of exactly the hijacking that poeple are afraid of (and that fear is not without reason).

Here is the example. What Derren Brown implants into his mark’s brain is not a meme per se, since it does not spread. But it does show that an idea can be implanted in such a way that it hijacks a person’s brain rather than becoming a passive item within it.

Here is one explanation for how this was done. Based on neurolinguistic programming

There are a bunch of tricks that D. Brown has played that expose deeply the vulnerabilities of our minds. He’s a magician; he doesn’t want his memes to spread. A magician never reveals the trick. But the tricks are out there, spreading by inducing people to spread them. The marketing magicians know it. I think we should too.

-Peter