
I've said it before, and I'll say it again: I love exhibits that talk about the scientific process. The latest was a small exhibition inside the Cincinnati Museum of Natural History on mummies. It was nicely done, with an ending that I really found fun.
The opening panel ends with this typical statement about the process and the extent of scientific knowledge:
Learn about some of the techniques scientists use today to study our scientific exploration of the mummy of a young Egyptian boy we have named Umi. Through modern scanning technology, radiometric dating, and rapid prototyping, we take a close-up look at Umi's body and two dozen artifacts beneath the linen wrappings. While science does not give us all the answers detailing his life and death, our research has provided many clues about Umi -- and even a few surprises.
We get a hint at techniques, specific methods, and limitations of what we can know. And we're enticed!
The bulk of the opening section of the exhibit is essentially a really nice technical description. (What is a mummy?, Mummy Chemistry, How are mummies studied?, The role of paleoimaging, etc.)
Because this museum came quick on the heels of my experience at the Creation Museum, it was hard not to compare the two. In this light, two things struck me about the opening section.
First, the admission that science doesnt have all the answers is a very common trope in exhibits of this sort. But these moments are really fascinating to me, because in one brief sentence they offer up the paradox of scientific authority (a paradox that the Creation Museum takes unfair advantage of).
Recently, this paradox became the core of a proposal. My case went like this:
On the one hand, the science museum dispels doubt, ignorance, and uncertainty by designing exhibits that inform visitors about what science knows. In so doing, the science museum asserts the authority of science as a body of knowledge. On the other hand, in their multidimensional, hands-on, interactive galleries, science museums promote a form of inquiry based on a fundamental appeal to what we don't know and don't understand. In so doing, the science museum cultivates a sense of science as a practice that emerges from uncertainty. Museums often accomplish both of these tasks (sometimes in the same installation) through the appeal to wonder and the use of questions, which provoke open exploration or prompt definite answers.
Exhibits like "The Science of Mummies" that point to the edges of scientific understanding simply sharpen this paradox. Here it does so in a rather non-chalant way. It doesn't make a big deal of the fact that it's walking a very fine, very subtle line between what science knows and what it does not.
We're all comfortable with this distinction -- science knows and yet doesn't know -- until the Creation Museum sticks in a wedge, and separates the two.
The second thing that struck me about the opening of this exhibit is really a question, perhaps with interesting implications. The exhibit points to two primary methods used to understand mummies: DNA testing and radiometric dating. DNA is ignored completely in the Creation Museum, but Radiometric dating is one of those things that it criticizes by saying that it is "based on assumptions." It doesn't disclose what those assumptions are or why they might (or probably don't) undermine the data radiometry provides.
So the question: What does a creationist do with an exhibit like this? Do they dispute the use of radiometry here? Do they dismiss it, saying age can be determined another way (contextually, for instance)? Honestly, it's hard for me not to expand way beyond the scope of this particular topic: how do creationists handle the speed of light, because if we agree with the speed of light, then telescopes indicate that the universe is _much_ older than they're dating system allows. This gets flip pretty quick, but if radiometry can't tell us how old rocks are or how old dinosaurs are, then it can't tell us how old mummies are, either, right? Surely I'm missing something.
Anyways, while the Creation Museum assails radiometry too easily, "The Science of Mummies" tries to explain how it works:
Radiometric dating is a method of providing absolute dates for organic archaeological materials based on the decay of radioactive isotopes. In modern archaeology, the majority of radiometric dates are derived from calculating the residue of a radioactive isotope of carbon called 14C. Radiocarbon dating is based upon the principle that all living organisms contain a constant proportion of 14C. 14C is no longer replenished when the organism dies, and 14C begins to decay t a constnat rate known as a half-life. If one knows the "half-life" and the amount of radioactive carbon left, then the absolute age of a specimin can be calculated. Because the actual amount of atmospheric radioactive carbon has fluctuated throughout recent times, these absolute dates are normally calibrated using curves established through dendrochrnology, or tree-ring dating.
Here the museum attempts to explain some of those fundamental "assumptions" that the Creation Museum fails to identify. And again, like in the introductory panel, there is clearly an element of uncertainty -- the need to triangulate findings -- that might make us question the value of these methods.
Here's what I want: I want a list of things that collapse, things from from science, medicine, and technology that no longer make any sense or are not possible when you jettison ideas like radiometric dating and natural selection. I want to know how those things are blackboxed into the everyday world of creationists. I want to make an argument like this: the same principles that x-ray your teeth, attack your cancer, fly your plains, and understand the solar system are based on the very ideas that they reject. I want to say: If you fly in an airplane, you can't be a creationist.
I'm now far afield, but you can see how visiting this museum has really colored my reading of other galleries.
So, back to the point. The general process approach in this exhibit was used used to talk about how science can determine the age of the mummy. Like all questions, this one makes us care, here about process. In a sense, then, we walk thorugh this gallery with the expectation that we'll get an answer at the end. So, how does it end? After all this talk of methods and research and evidence and the real mummy itself, the final panel is titled: How old is Umi's Mummy? Our Hypothesis.
When I encountered this panel, even I laughed: after all that, all we get is a crummy hypothesis? But there's more! We also get a description of the scientific method.
The panel begins:
The scientific method is how scientists conduct their research. The first step is observation, which leads to the development of a hypothesis. The hypothesis has no validity as an explanation, but is important in designing experiments. The best experiments are conducted to disprove the hypothesis. However, if repeated experimentation supports the hypothesis, the hypothesis is accepted and is then called a theory.
A bit basic for my tastes, but better than nothing, and it's rarely so well explained. The final bit of the exhibit is also fascinating for what it says about process and knowledge.
Drum roll please... The radiocarbon age of Umi's mummy is 80-210 CE (AD) or 1,740 to 1870 years old. This is at least partially within our hypothesized data range. The 130 year carbon range actually represents one standard deviation (or variation from the mean) with a 68% probability that the actual dates would fall within that range. At two standard deviations, the range increases to 60-240 CE (AD), but the probability of the actual date falling within this range is now 95%.
Not exactly scientific certainty. Definitely based on some assumptions. But can we live with this? I imagine a creationist in this exhibit would be completely flummoxed.
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