The first U.S. charter school opened in 1992. Since then the number of charters has grown to more than 4,000 in 40 states, serving 1.2 million students, according to RAND, a nonprofit research organization based in Santa Monica, California.

Students at charter schools graduate and attend college at significantly higher rates than students at traditional public schools, according to a Rand Corp. study led by a Michigan State University scholar.The study, which offers mixed overall results for charter school advocates, comes amid a national debate over President Obama's endorsement of charter schools, which are experimental public schools that operate independently of the local school board.

Do you have what it takes to be Scientific Blogging's alpha geek? Well it’s time put your geek where your mouth is…IF YOU CAN!

But first a warning: yes, you could Google for these answers, but then, deep down, you’ll know you’re a bad person. Then again, you might win a free Geeks’ Guide to World Domination. So you’ll have to balance total loss of self worth with free geek schwag. It’s up to you.

A baffling report says health workers fail to understand the importance of sex for Tanzanian children.   Yes, children.

Community health organizations working on AIDS prevention projects in Tanzania, frequently fail to understand how children in Tanzania deal with sex, says Miranda van Reeuwijk, who followed groups of children in Tanzania between 2004 and 2008.  

van Reeuwijk followed the children in order to help change this situation and says the children mainly view sex as something from which they can personally benefit, but frequently hide their relationships from parents and health workers. They are more scared of their strict parents than of HIV. 

Melatonin can slow down the effects of aging, according to a team at laboratoire Arago in Banyuls sur Mer (CNRS / Université Pierre et Marie Curie) who say that a treatment based on melatonin can delay the first signs of aging in a small mammal.

Better known as the ‘time-keeping' hormone, melatonin is naturally secreted by the body during the night. It is therefore a kind of biological signal for nightfall, allowing an organism to synchronize itself with the day/night rhythm.

The largest artificial underground cav in Israel has been exposed in the Jordan Valley in the course of a survey carried out by the University of Haifa's Department of Archaeology. Prof. Adam Zertal, who headed the excavating team, reckons that this cave was originally a large quarry during the Roman and Byzantine era and was one of its kind. Various engravings were uncovered in the cave, including cross markings, and it is assumed that this could have been an early monastery.

"It is probably the site of "Galgala" from the historical Madaba Map," Prof. Zertal says.

A toxic molecule implicated in cell damage and disease  may also be essential for bird migration, according to the University of Illinois. They propose the molecule superoxide as a key player in the mysterious process that allows birds to 'see' Earth's magnetic field.

Where we are born not only determines how we speak apparently how we taste food and drink, according to Andy Taylor, a researcher in flavor technology at The University of Nottingham and Greg Tucker, a food psychologist.

The taste preferences of the UK's major regions have been analyzed by the pair and Taylor of the Flavour Research Group said, "Taste is determined by our genetic make-up and influenced by our upbringing and experience with flavours. Just as with spoken dialects, where accent is placed on different syllables and vowel formations, people from different regions have developed enhanced sensitivities to certain taste sensation and seek foods that trigger these."

At the quantum level, the atoms that make up matter and the photons that make up light behave in seemingly bizarre ways.

Particles can exist in "superposition," in more than one state at the same time (don't look!), a situation that permitted Schrödinger's famed cat to be simultaneously alive and dead.  Matter can also be entangled', what Albert Einstein called "spooky action at a distance" in such a way that one thing influences another, regardless of how far apart the two are.

Human brains have tripled in size over the past 2 million years,  growing much faster than those of other mammals.

What might the reasons be for such dramatic brain expansion?

University of Missouri researchers studied three hypotheses for brain growth: ecological demand,  social competition and climate change.

Yes, climate change.   They're not stupid.   An entire presidential cabinet is stuffed with carbon dioxide true believers so it's good diplomacy to at least consider global warming may make us devolve - that would be terrific marketing for a carbon trading scheme.   Luckily, the much more likely social competition was determined in their analysis as the major cause of increased cranial capacity.

The largest animals ever to have walked the face of the earth just got a little smaller, according to a paper published today in the Zoological Society of London's Journal of Zoology.

Why aren't they as big as previously thought?   The researchers say that the original statistical model used to calculate dinosaur mass is flawed, which led to them suggesting dinosaurs have been oversized.  Widely cited estimates for the mass of Apatosaurus louisae, one of the largest of the dinosaurs, may be double that of its actual mass instead of the commonly cited 33-38 tons it may be as light as 18 tons.