Skepticblog

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This week’s Skeptoid episode is about left-handedness. Not about the popular anecdotes you can read on any web site, but about the deeper science behind how and why left-handedness exists at all, and what the implications are for those who roll to the left.

Skeptoid is a short program and I can’t ever include all the neat stuff I uncover, so occasionally I’ll throw a supplemental bit here. This week I found one tidbit that was particularly interesting that I wasn’t able to squeeze into the show. A crazy tidbit that I did discuss in detail was that left-handers gradually die out of the population faster than right-handers: the older the age group you sample, the smaller percentage of lefties you’ll find. By age 90, living left-handers are practically nonexistent. This isn’t because they change over and become right-handers, it’s because they literally die out of the population, due to a combination of risk factors associated with sinistrality. (continue reading…)

As I discussed in a previous post (April 11), the people who deny anthropogenic global warming (AGW) have many similarities to creationists. Despite the fact that the reality of AGW is supported by a 95% or greater consensus of qualified climate scientists, the critics (mostly non-scientists, or scientists in fields that do not qualify them to assess climate science) keep on repeating the same false tropes over and over again, no matter how many times they are debunked. This is analogous to the shopworn old arguments of creationists, who invariably trot out fallacious arguments like “evolution contradicts the Second Law of Thermodynamics” even though it has been corrected hundreds of times by scientists. The creationists have such a strong denial filter to resolve their cognitive dissonance that they either don’t realize why their “Second Law” argument is invalid, or they are deliberately and deceptively using it over and over again because it impresses their scientifically illiterate following.

The same is true of the long-debunked example of cherry picking, “It hasn’t warmed since 1998″ (see my April 11 post). Another common false statement is “The planet warmed just as much during the Medieval Warm Period, but eventually it cooled down again.” They argue that if this warming preceded our modern injection of carbon dioxide into the atmosphere, then maybe our current global warming not caused by our burning of fossil fuels. Climate deniers repeat this old saw over and over again as if it’s somehow a devastating blow to the huge body of data about our recent climate changes. They often illustrate it with the anecdotes about how the Vikings could colonize Greenland for a while, then as climate cooled in the late Middle Ages, these colonies failed when Greenland became too cold again. The story about the fate of Viking colonies in Greenland is true—but the rest is not.

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The subculture of pseudoscientific ghost hunting continues to evolve. Have you heard of a “ghost box?” It seems all you have to do is put the word “ghost” in front of something and it becomes technical jargon for ghost hunters, and also a great example of begging the question. A cold spot in a house is therefore “ghost cold.” An electromagnetic field (EMF) detector becomes a “ghost detector.” And now a radio scanner has been rebranded as a “ghost box.” Of course no one has ever established that any of these phenomena have anything to do with ghosts, so they are putting the cart several miles ahead of the horse.

A more scientific and intellectually honest approach would be to declare such phenomena as anomalous (although I don’t think that they are). Ghost cold would more properly be termed anomalous cold, or a regional cold anomaly, or something like that. One hypothesis for the alleged cold anomaly would be some sort of supernatural entity (call it a ghost) that acts as a heat sink generating cold spots. First, however, researchers should endeavor to find a mundane explanation for the cold. In fact before declaring it an anomaly they should thoroughly rule out any possible explanation. Only when that has been adequately done would they have a tentative anomaly.

It would then be reasonable to generate a hypothesis as to what is causing the anomalous cold, but such hypotheses are only useful if they lead to testable predictions. If the regional cold anomaly phenomenon is the result of “ghosts”, then what might we predict from that and how can we test it? I don’t know of any way to definitively test it, as ghosts are not a well-defined phenomenon, but perhaps there are some preliminary tests that could be done. For example, is there at least a correlation between cold spots and experiences often interpreted as ghosts or hauntings? Perhaps cold spots are just as likely in homes without other such “ghost phenomena.” Such a correlation would not prove the ghost hypothesis, of course, but it would at least be a start, and the lack of correlation would seriously jeopardize the hypothesis.

Ghost hunters, however, skip over all of this scientific methodology and reasoning and simply declare cold spots “ghost cold” and then use them as evidence for ghosts. They are then puzzled when scientists and skeptics don’t accept what they consider to be compelling evidence for ghosts, but what is really compelling evidence for the complete lack of scientific understanding on the part of ghost hunters.

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When you hear creationists argue their cause, sooner or later they reach into their standard litany of debunked arguments. One of their favorites (since it sounds convincing to their largely math-illiterate followers) is to point to the complexity of a molecular system or the cell or any other part of nature and “how could such a complicated system arise BY CHANCE?” The bigger implication is that they cannot fathom humans and their religious worldview being produced by anything other than a supernatural creator, so chance (as they misunderstand the concept) cannot produce it. The same argument underlies much of what the “intelligent design” creationists claim as well.

There are many versions of this argument, all of which are equally fallacious. When I debated Duane Gish at Purdue University in 1983, he was using his favorite line of his whole spiel, stolen from the maverick astronomer Fred Hoyle (legendary for being wrong on nearly every thing he argued, including Big Bang cosmology and his attacks on Archaeopteryx and evolution). In Gish’s version, he argues that the probability of random evolution assembling the complex system of life was as likely as a tornado in a junkyard assembling a Boeing 707 (which shows how ancient this punchline was).

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Where in the world are the atheists? That is, in what part of the globe will one find the most people who do not believe in God? Answer: East Germany at 52.1%. The least? The Philippines at less than 1%. Predictably, strong belief shows a reverse pattern: 84% in the Philippines to 4% in Japan, with East Germany at the second lowest in strong belief at 8%. Not surprising, those who believe in a personal God “who concerns himself with every human being personally” is lowest in East Germany at 8% and highest in the Philippines at 92%.

These numbers, and others, were collected and crunched by Tom W. Smith of the National Opinion Research Center (NORC) at the University of Chicago, in a paper entitled “Beliefs About God Across Time and Countries,” produced for the International Social Survey Programme (ISSP) and released on April 18, 2012. Smith writes: “Countries with high atheism (and low strong belief) tend to be ex-Socialist states and countries in northwest Europe. Countries with low atheism and high strong belief tend to be Catholic societies, especially in the developing world, plus the United States, Israel, and Orthodox Cyprus.”

Many religious scholars invoke the “secularization thesis” to explain lower religiosity in Northern European countries (compared to the United States) in which mass education, especially in the sciences, coupled to the fact that governments do what religions traditionally did in the past in taking care of the poor and needy. With a tight social safety net religions simply fall into disuse; with a porous social safety net people fall through the cracks and are picked up by religions. Other scholars have suggested a “supply side” explanation for the difference between the U.S. and Europe, in which churches and religions in America must compete for limited resources and customers and thus have ratcheted up the quality of religious products and services: mega churches with rock music, baby sitting, BBQs, and even free parking! Smith seems to find evidence of both forces at work, noting that “In the case of Poland, it appears that its strong Catholicism trumps the secularizing influence of Socialism,” whereas elsewhere in the world “there is also evidence that religious competition and/or religious conflict may stimulate higher belief.” (continue reading…)

I am often asked, and wonder myself, if there are significant hard-wired and genetically determined brain differences between skeptics and new agers or conspiracy theorists (or name your favorite flavor of true believer). It can certainly feel this way when you are knee deep in a cyber-debate with someone with a radically different world-view than yourself. Obviously there is no simple answer to this question. Biological brain effects are filtered through culture, education, and personal experience, which in turn have an effect on the wiring of the brain (the brain has memory and learns from experience). Further, genetically determined hard-wiring, to the extent that this exists, is extremely complex, with many factors affecting each other.

While it may be difficult to tease out the contribution of genetic hard-wiring to things like belief in fairies, I think it remains an open question and it is not implausible that there is a significant contribution in some cases. Perhaps to some extent the conflict between skeptics and true believers is really a competition between different  versions of human brain wiring. Perhaps we will need to just accept this neurodiversity (its existence, if not its effect on our culture).

While this is a fascinating question, at the same time I feel there is a tendency in popular culture, especially among journalists and (ironically) some purveyors of dubious products and services, to reframe many phenomena with specific reference to the brain. Old fashioned learning is now “training your brain,” for example. While this is technically true, it makes it seem like a new, targeted, reductionist technology when in fact it’s just practice and learning.

A recent study explored one small aspect of the question of brain function and spirituality – researchers asked themselves if those healers and gurus who claim to be able to see a human aura are really synaesthetes, people with a hyperrobust connection among different brain regions that make them smell color, taste sound, feel numbers, or otherwise experience one sensation or experience with an overlay of another sensation. There is a form of synaethesia in which people experience the faces of those familiar to them as having a specific color.

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Once in a while I come upon an old ghost story or monster story that I’d never seen before. It happened again on a recent father-son weekend trip to Death Valley, our favorite family destination.

Throughout Death Valley are remote cabins left over from the mining days. Many of them have been partially restored to various levels of livability, and are meticulously maintained by volunteers who frequent them. They’re often stocked with spare tools and supplies, and at least one I’ve visited even has running water piped in from a spring. Nearly all of them have shelves of knick knacks — bits and pieces of mining history collected from the surroundings — and always a lot of books.

We were at one such cabin in the Tucki Mine area. Visitors are always welcome in these cabins, and we signed the guest book. I flipped through some of the books on one shelf and found a small one I hadn’t seen before, a little storybook full of ghostly tales and legends of Death Valley. Here is the story I read:

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Last week, I attended the annual meeting of the American Association of Petroleum Geologists (AAPG), held in Long Beach, California, from April 21-25. 2012. Although I have done lots of consulting with oil companies over the years, have taught the basics of oil geology all my career, and have many former students working in oil companies, I’m still primarily an academic geologist. Normally I attend the Geological Society of America (GSA) meeting each fall, which is the principal professional meeting for nearly all academic and research geologists. However, it was important for me to attend this AAPG, since I’m currently President of the Pacific Section SEPM (Society for Sedimentary Geology), and had to chair an Executive Committee meeting, judge student posters for our Cooper Award, and present our Lifetime Achievement Award as well. But each time I attend the AAPG meeting, I’m immediately struck by the huge differences between it and more academic conferences like GSA.

The most obvious difference is MONEY: the exhibit area for AAPG is HUGE, and filled with gigantic expensive booths from many of the major companies like Schlumberger and Halliburton. These booths have mini-lecture theaters with multiple big-screen displays where they give free seminars on their methods, thick plush carpets, potted plants, free food and drink, and fancy furniture—all for less than 3 days that the exhibits are open! Professional registration for this meeting is expensive (since most oil geologists make MUCH more than academic geologists, and the oil companies pay their employees to attend), and the dress code is also suits and ties for men (it’s much more casual at academic conferences). You can just smell the money at the meeting, and see lots of geologists hungry to learn techniques so they can jump to a more profitable position in their company, or go off and get rich as an independent (all of whom have smaller booths there as well).

The second difference is the emphasis of the meeting. At GSA, nearly 6000 attendees give more than 4000 talks or posters, 20 talks every 15 minutes for four straight days plus hundreds of posters. By contrast, for the same attendance there were only 5-6 20-minute talks at any given time at AAPG in less than 3 days, and the majority of the attendees didn’t present anything. Their job is to do whatever their company pays them to do, not churn out new research results to present at a meeting every year, like academic geologists must. Most AAPG talks tend to be very narrow and describe details of one particular oil field, not independent research into general principles of geology that academics are trying to decipher. Finally, the demographic differences are striking. Academic geologists are nearly 50% women now, and they are distributed across all age classes. Oil geologists, by contrast, are nearly all old white guys in their 60s or older, with a lot of young men (and a few women) just recently hired in the business. The entire generation that would now be in their 40s and 50s is missing because of the attrition during the oil busts of the late 80s-90s. (continue reading…)

There is an ongoing scientific discussion about the safety of long term cell phone use. The primary question  is whether or not long term exposure to non-ionizing radiation can increase the risk of brain cancer. There are further questions about whether or not such radiation can cause any health problems or symptoms.

As with any complex area of scientific research, perhaps the best way to evaluate the question is to put together a panel of experts to review all the existing evidence and then come up with a consensus opinion about that evidence. This is no guarantee of being right – the primary issue that tends to come up with such expert panels is that they were systematically biased toward one side of the debate. But assuming no major asymmetry in the constitution of an expert panel, they are an excellent way to evaluate the current state of the evidence on a specific question. Even better, of course, is when multiple independent panels all agree.

Recently an expert panel for the UK’s Health Protection Agency (HPA) reviewed the evidence for cell phone safety concluded that there is no clear evidence for any harm. This is good news. Their findings are similar to other reviews of the evidence, although often there is a difference in emphasis. For example, last year the International Agency for Research on Cancer (IARC) reviewed the same evidence and concluded that:

 ”the evidence, while still accumulating, is strong enough to support a conclusion and the 2B classification. The conclusion means that there could be some risk, and therefore we need to keep a close watch for a link between cell phones and cancer risk.”

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