Is Psychometric g a Myth?
- "As an online discussion about IQ or general intelligence grows longer, the probability of someone linking to statistician Cosma Shalizi's essay g, a Statistical Myth
approaches 1. Usually the link is accompanied by an assertion to the effect that Shalizi offers a definitive refutation of the concept of general mental ability, or psychometric g
." [more inside]
posted by kliuless
on Apr 11, 2013 -
Five years ago this week, the BBC started broadcasting one of the most extraordinary documentaries ever to grace television: Planet Earth
. The culmination of five years of field work
, it employed the most cutting-edge of techniques
in order to capture life in all its forms, from sweeping spaceborne vistas to shockingly intimate close-ups
-- including many sights
rarely glimpsed by human eyes. Visually spectacular
, it showcased footage shot in 204 locations in 62 countries
, thoroughly documenting every biome from the snowy peaks of the Himalayas to the lifegiving waters of the Okavango Delta
, a rich narrative tapestry backed by a stirring orchestral score
from the BBC Concert Orchestra. Unfortunately, the series underwent some editorial changes
for rebroadcast overseas. But now fans outside the UK can rejoice -- all eleven chapters of this epic story are available on YouTube in their original form: uncut, in glorious 1080p HD, and with the original narration by renowned naturalist Sir David Attenborough
. Click inside for the full listing (and kiss the rest of your week goodbye). [more inside]
posted by Rhaomi
on Mar 7, 2011 -
Imagine nature's most elegant ideas organized by design and engineering function, so you can enter "filter salt from water" and see how mangroves, penguins, and shorebirds desalinate without fossil fuels. That's the idea behind AskNature
, the online inspiration source for the biomimicry
community. The featured pages
are a good starting point. Cross-pollinating biology with design. [more inside]
posted by netbros
on Jun 5, 2009 -
Hunting the Hidden Dimension.
You may be familiar with fractals, but in this PBS Nova episode, divided online into 5 parts, fractals go beyond the impossible zoom of the Mandelbrot set
. Scientists are using fractals to describe complex natural occurrences, like lava
, and rain forests
. In part 5, scientists measure one tree in the rain forests, and the distribution of small and large branches mirror the distribution of small and large trees. Fractals, it seems, are nature
posted by plexi
on Nov 2, 2008 -
"With most animals, males duke it out and the winner gets the girls," says Holekamp. "But with hyenas, females have 100 percent say." They decide when and under what conditions they will tolerate deferential sperm donors. At age 2 or 3 a male leaves his natal clan and wanders off to beg acceptance into another clan. After vicious rejections, he eventually succeeds and reaps his reward: brutal harassment as the clan's nadir, one of the last in line for food and sex. This probation, which biologists call "endurance rivalry," is a test, Holekamp explains: "The guy who can stick it out the longest wins." The trial lasts about two years, after which some females may grant him access. "You do not want to be a male hyena," Holekamp says.
-From an article in Smithsonian Magazine, Who's Laughing Now?
Professor Holekamp's hyena site
. Also, hyena pictures
and The Hyena Pages
, a fine site about this fascinating animal.
posted by Kattullus
on May 7, 2008 -
While the dream of immortality might be as old as mankind, the jellyfish Turritopsis nutricula (image)
seems to be living it
The hydrozoan Turritopsis nutricula has evolved a remarkable variation on this theme, and in so doing appears to have achieved immortality. The solitary medusa of this species can revert to its polyp stage after becoming sexually mature (Bavestrello et al., 1992; Piraino et al., 1996). In the laboratory, 100% of these medusae regularly undergo this change. Thus, it is possible that organismic death does not occur in this species!An in-depth research paper
posted by Foci for Analysis
on Jan 30, 2008 -
'Provided for your delight are a small number of the world's butterflies and moths, taken from Dru Drury's three-volume monograph entitled Illustrations of Exotic Entomology.'
Related :- Schreber's Fabulous Beasts.
'In 1774 Johann Christian Dan Schreber authored a multivolume set of books entitled Die Saugthiere in Abbildungen nach der Natur mit Beschreibungen. Focusing on mammals of the world, these books were lavishly illustrated with 755 hand-colored plates ... '
posted by plep
on Jul 5, 2003 -