Showing posts with label Berkeley. Show all posts
Showing posts with label Berkeley. Show all posts

Thursday, October 08, 2015

Or is Homo naledi Actually Homo erectus?

California Magazine, from the University of California at Berzerkeley, has an article written by Glen Martin, in which he details the skepticism about the taxonomic status of Homo naledi, specifically, that it does not represent a new species.  Martin writes:
The popular science press went bonkers last month with news that fossilized bones of a previously unknown hominid had been discovered in a cave system in South Africa. Dubbed Homo naledi by lead researcher and University of the Witwatersrand paleoanthropologist Lee Berger, these proto-humans appeared to have lived somewhere between 1 to 3 million years ago, used tools, walked upright, and may have buried their dead, a practice that has only been attributed to our own species, Homo sapiens, and Neanderthals.

So there was a lot of talk of a “missing link”—the biggest find in paleoanthropology since Lucy, the skeleton of a female
Australopithecus, was excavated from a gully near Ethiopia’s Awash River in 1974. (Donald Johanson, the lead researcher in Lucy’s discovery team, founded the Institute of Human Origins, which later moved from Berkeley to Arizona State.)
As I mentioned in my post on the find, echoed by PZ Myers, at Pharyngula, this notion of a “missing link” is a straw man that has been created by the popular press and jumped on by organizations like the Discovery Institute and Answers in Genesis.  Martin continues:
Amid all the hoopla and confetti, however, a growing number of scientists are advising caution. They’re not denying the importance of the find; the fossils, they say, are invaluable. But they contend that the bones may not represent a new species. The evidence these skeptics point to suggests that the finds may actually be bones from
Homo erectus, the earliest known hominid to manifest the general proportions, stance and gait of modern humans. H. erectus had a long tenure on the planet, living from about 2 million to 70,000 years ago. The species was widely distributed (from Africa to East Asia and possibly southern Europe), used tools and fire, and may have constructed rafts to cross wide bodies of water.
Berger maintains that the skulls are too small, with too many primitive characteristics to be Homo erectus.  Once again, though, we come to the problem of how old the bones are.  Here, White is particularly critical:
One tibia, for example, was white on one end, a clear indication it had been snapped off in the recent past,” said White. “This (region’s) complex is extensive and like Swiss cheese, and it’s a favorite with spelunkers. You find beer cans next to fossils that are 3.5 million years old. So it’s important not to jump to conclusions.”
If the bones are late, as is possible, then the finds (or at least parts of them) might represent a Homo erectus population that has late primitive retentions. Even if there is more than one species present, there is no getting around the fact that the small, primitive cranium is where the Homo erectus traits are found, as well.

Berger is quoted as saying that this debate should play out in the published literature.  I suspect it will and that, eventually, we will figure out what sorts of primitive and derived traits the cache in the cave actually represents, even if we might never know exactly how old they are.

Wednesday, December 30, 2009

Slightly Off-Topic: "Paging Harrison Bergeron!"

Only in Berkeley. The East Bay Express has a story on the redesign of the Berkeley High School, in which the school's science budget, including labs will be cut by 30% so that the money can be funneled to programs for underprivileged students. Eric Klein writes:
The proposal to put the science-lab cuts on the table was approved recently by Berkeley High's School Governance Council, a body of teachers, parents, and students who oversee a plan to change the structure of the high school to address Berkeley's dismal racial achievement gap, where white students are doing far better than the state average while black and Latino students are doing worse.

Paul Gibson, an alternate parent representative on the School Governance Council, said that information presented at council meetings suggests that the science labs were largely classes for white students. He said the decision to consider cutting the labs in order to redirect resources to underperforming students was virtually unanimous.
So, lets see. The solution is not to interest underprivileged students in science and science-related disciplines but, rather, to reduce science education to the lowest common denominator in an effort to equalize education. How did the science teachers react?
Science teachers were understandably horrified by the proposal. "The majority of the science department believes that this major policy decision affecting the entire student body, the faculty, and the community has been made without any notification, without a hearing," said Mardi Sicular-Mertens, the senior member of Berkeley High School's science department, at last week's school board meeting.
At a time when science education is becoming increasingly important and the United States is falling further behind in science worldwide, this is absolutely bassackwards. The comments below the article are scathing. Patterico also picked up the story. He writes:
It seems to me struggling students of every race would be better served by more science labs, not fewer ones, but this will be especially hard on any minority student currently benefiting from a science lab. I guess they and their white counterparts must sacrifice so more Berkeley High students score the same.
What is peculiar about the article is the complete lack of information about what kinds of programs will be instituted to help these students instead of science programs. That information will probably not be forthcoming. As one of Patterico's reader's wrote:
Frankly, I’d pull the accreditation of a high school district that did this.
Sadly, there is little chance of that happening. Another thing, though: if there are fewer science students around, who is going to pray at The Atheon? Someone once said "If your mind gets too open, your brains will fall out." They seem to be lying all over the ground in Berzerkeley, California.

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