In high doses, ultraviolet light can damage skin and DNA molecules, but the body does need some UV light to help us produce vitamin D. Our bodies use melanin to regulate how much UV light our skin lets in.

Courtesy George Chaplin

Ultraviolet Light And Pregnancy

Because women build babies in their wombs, they need more vitamin D to produce extra calcium for the baby’s bones. Could that explain this difference: When scientists look at the underarm skin of men and women in every color group of humans, the women on average are always lighter than the men. Are the ladies lighter to produce a little extra Vitamin D for the babies?

• Listen: Dr. Nina Jablonski describes the “Under Arm” test.

To begin, please point your elbow to the ceiling.

Then imagine yourself naked.

Then look at the patch of skin on the inside of your upper arm, the part of you that almost never sees the sun.

Whatever color you see there is what experts call your basic skin color, according to professor Nina Jablonski, head of the Penn State Department of Anthropology.

And that color, the one you have now, says Jablonski, is very probably not the color your ancient ancestors had — even if you think your family has been the same color for a long, long time.

Different Place, Different Color

Skin has changed color in human lineages much faster than scientists had previously supposed, even without intermarriage, Jablonski says. Recent developments in comparative genomics allow scientists to sample the DNA in modern humans.

By creating genetic “clocks,” scientists can make fairly careful guesses about when particular groups became the color they are today. And with the help of paleontologists and anthropologists, scientists can go further: They can wind the clock back and see what colors these populations were going back tens of thousands of years, says Jablonski.

She says that for many families on the planet, if we look back only 100 or 200 generations (that’s as few as 2,500 years), “almost all of us were in a different place and we had a different color.”

Over the last 50,000 years, populations have gone from dark pigmented to lighter skin, and people have also gone the other way, from light skin back to darker skin, she says.

“People living now in southern parts of India [and Sri Lanka] are extremely darkly pigmented,” Jablonski says. But their great, great ancestors lived much farther north, and when they migrated south, their pigmentation redarkened.

“There has probably been a redarkening of several groups of humans.”

Why We Change Color

The repigmenting process is increasingly well understood.

“Humans started in Africa,” Jablonski says, the part of Africa near the equator where it is intensely sunny with lots of ultraviolet light.

Ultraviolet light, or UV, in high doses can age the skin and damage the DNA molecule, which makes it harder to build a fetus. Not to mention that ultraviolet light can sometimes cause skin cancer.

On the other hand, if a human is plopped down in, say, Norway, where the days can be short and there is precious little ultraviolet light, this creates problems, too. All vertebrate animals need ultraviolet light to help produce vitamin D. Vitamin D helps us absorb calcium from our food to build strong bones. If we don’t get enough ultraviolet light, we’re less likely to survive to reproductive age to produce strong-boned babies.

Thus the dilemma: People who live in sunny climes around the equator have too much UV. People who move away from the equator eventually have too little UV.

Hooray For Melanin

The solution is what Jablonski calls “a really cool molecule”: melanin. In different concentrations, melanin makes skin lighter or darker. Kind of like a Venetian blind, it can let UV light in or keep it out.

Melanin has evolved in many different animals. Humans have had it for a long, long time and what Jablonski and others have learned is that when early humans migrated from the equator, their melanin levels changed.

That doesn’t mean they lost their tans. It means they had very specific genetic changes that allowed them to live and successfully reproduce in less sunny places. Darwin teaches that these changes began randomly. Somebody in the population at some point had a baby, and that baby, just by chance, had a little change in its DNA that made her skin, for example, a little lighter. When that baby moved north to Europe, lighter skin gave her an advantage as a grown-up, because it helped her produce strong-boned babies who could survive and have babies of their own.

Successive mutations created successive generations of lighter and lighter people as they moved north.

“This, in short, really created the gradation of skin color that we see in modern humans today,” says Jablonski. Her map of UV radiation levels on Earth closely mirrors the array of skin colors on Earth.

Skin Color Is A Fleeting Thing

The big surprise is how fast these changes can occur.

“Our original estimates were that [skin color changes] occurred perhaps at a more stately pace,” Jablonski says. But now they’re finding that a population can be one color (light or dark) and 100 generations later — with no intermarriage — be a very different color.

Figuring 25 years per generation (which is generous, since early humans walked naked through the world — clothes slow down the rate), that’s an astonishingly short interval.

It’s “a blink of an eye,” she says.

Audio & More available at NPR (Click Below)

Your Family May Once Have Been A Different Color : NPR.

The aggressive pursuit of personal success by adults is now the greatest threat to British children, a major independent report on childhood says.

It calls for a sea-change in social attitudes and policies to counter the damage done to children by society.

Family break-up, unprincipled advertising, too much competition in education and income inequality are mentioned as big contributing factors.

A panel of independent experts carried out the study over three years.

The report, called The Good Childhood Inquiry and commissioned by the Children’s Society, concludes that children’s lives in Britain have become “more difficult than in the past”, adding that “more young people are anxious and troubled”.

According to the panel, “excessive individualism” is to blame for many of the problems children face and needs to be replaced by a value system where people seek satisfaction more from helping others rather than pursuing private advantage.

A spokesman for the Department for Children Schools and Families said: “We know there are still risks and challenges ahead for children and parents and that there is more for us all to do”.

‘Tone deaf’

The inquiry has a long list of recommendations including:

• abolishing Sats tests and league tables in English schools

• a ban on all advertising aimed at the under 12s and no TV commercials for alcohol or unhealthy food before the 9pm watershed

• stopping building on any open space where children play

• a high-quality youth centre for every 5,000 young people

“Individual freedom and self-determination bring many blessings,” writes the report’s principal author, Labour peer Lord Richard Layard.

“But in Britain… the balance has tilted too far,” he says.

Another contributor, the Archbishop of Canterbury Rowan Williams, suggests society has become “tone-deaf to the real requirements of children… in a climate where the mixture of sentimentalism and panic makes discussion of children’s issues so difficult”.

The panel, made up of 11 experts including eight university professors, says its conclusions are evidence based.

But some of its findings on family life in Britain are bound to be controversial.

Working mothers

It cites research suggesting that three times as many three year olds living with lone parents or a step-parent have behavioural problems compared with those living with married parents.

Children with separate, single or step parents are 50% more likely to fail at school, have low esteem, be unpopular with other children and have behavioural difficulties, anxiety or depression,” it argues.

“Child-rearing is one of the most challenging tasks in life and ideally it requires two people,” the report concludes.

It also suggests that having many more working mothers has contributed to the damage done to children.

MORE…

BBC NEWS | UK | Education | Selfish adults ‘damage childhood’.

“Barack Obama is opening our hearts and minds to the true meaning of Black History Month,” Barron said. “African Americans won’t be viewed as just a minority but as people who make a difference.”

Obama’s election, and this year’s 100th anniversary of the NAACP, means there has probably never been more reason to celebrate the annual February observance, black leaders and historians say.

“We celebrate whenever a glass ceiling is broken and the presidency may be the highest glass ceiling,” said Benjamin Todd Jealous, president and CEO of the NAACP, which is celebrating its 1909 founding this year.

But those leaders also agree those milestones don’t mean that racial inequalities no longer exist. While Obama’s breaking of the color barrier in the White House may make the NAACP’s job easier, Jealous said they will pressure Obama just as they have past presidents.

Gerald Early, a professor of African American Studies at Washington University in St. Louis, said that Obama’s election should not be viewed as the end of racism, but “should be taught as an event that signaled a new era in American race relations.”

“With Obama as president, I think people are more optimistic about race relations than they’ve been in a long time,” he said.

This optimism is seen in Black History Month celebrations planned throughout this month in the 1,700 local NAACP units and hundreds of primary, secondary and university campuses nationwide.

This year’s Black History Month theme is “The Quest for Citizenship in the Americas,” determined by the Association for the Study of African American Life and History, said Daryl Scott, vice president for programs.

Stephanie Smith Budhai, 23, head of the University of Maryland’s Black History Month Committee, said the theme correlates well with Obama’s presidency.

“Barack Obama shows that (African Americans’) citizenship is just as important as the citizenship of any other ethnicity or race,” she said.

Black History Month has added meaning in 2009 – USATODAY.com.

As technology evolved over the past few decades, power has passed from the hands of the creators or delivery channels of information to its users — you. (AFP/Getty Images)

Media Is Changing, But Some Things Endure, Jeff Greenfield On The Evolution Of The Media, And How Some Timeless Qualities Withstand Change – CBS News.

Nearly 4 1/2 years ago, Barack Obama introduced himself to America by painting a picture of a country that was united, somehow, in spite of itself. The pundits, he said in the keynote address to the Democratic National Convention, like to “slice and dice” the country: red states for Republicans, blue states for Democrats. “But I’ve got news for them too: We worship an awesome God in the blue states, and we don’t like federal agents poking around our libraries in the red states. We coach Little League in the blue states, and yes, we’ve got some gay friends in the red states.” His task that night in Boston was to ready the crowd for the presidential nominee, John F. Kerry, but in the end his words were most memorable for an argument that challenged the partisan divide and was built on the foundation of his own unique story.

His father was from Kenya and his mother from Kansas. But it’s more complicated than that.

Abandoned by his father, separated for long periods from his mother, Obama searched for many years to find his identity. He eventually learned to navigate between black and white worlds. He earned a reputation as a pragmatist and a consensus builder, and along the way raised the bridges that would sustain his ambition.

Race has been the steady undertow of his political career — and of his life.

As he paraphrased William Faulkner in March in a landmark speech on race: “The past isn’t dead and buried. In fact, it isn’t even past.”

Early years

Interracial relationships in Hawaii are an accepted fact of life. Nevertheless, the parents of Stanley Ann Dunham and Barack Hussein Obama didn’t like the idea of their children getting married. She was studying anthropology at the University of Hawaii. He was a graduate student from Kenya, the first African enrolled at the university.

They married in late 1960, and on Aug. 4, 1961, Barack Jr. was born. Two years after that, his father left to study economics at Harvard.

The separation led to divorce. Ann married Lolo Soetoro, an Indonesian student at the university. In 1967, she and her 6-year-old son, whom she called Barry, followed Soetoro to Jakarta, a strange and wonderful place of kite-flying and crocodiles, exotic foods and strange religions.

But the adventure had a darker side. The poverty was inescapable. Ann and Lolo drifted apart. She took a job teaching English at the U.S. Embassy, and it was here in the library, Obama said, that he read about a black man who had tried to peel off his skin.

Although his mother tried to affirm his black heritage — bringing home books about the civil rights movement, speeches by Martin Luther King Jr. — Barry was learning the price people pay for being different.

When he was 10, his mother sent him back to Hawaii to live with her parents and attend the prestigious Punahou School. On an island where there were few blacks, he watched “I Spy” on television, tried to sing like Marvin Gaye and cursed like Richard Pryor. He stayed out late, shooting hoops, and started to drink and smoke weed, he said, just to “push questions of who I was out of my mind.”

On the mainland, the reality of race was more stark.

Full Article Here:

Barack Obama: In search of identity – Los Angeles Times.

KANSAS CITY, Missouri (Reuters) – From billion-dollar ponzi schemes to bad mortgages and pay-to-play dealings by public officials, some are asking: Is there a crisis of ethics in America?

The swirl of corruption, fraud and greed stretching from Wall Street to Main Street has many U.S. church leaders saying the answer is a resounding yes — America is facing not only an economic meltdown, but also a moral one. And they are rushing to bring flocks back into the fold.

“Honesty is honesty. It doesn’t matter if you are Christian, Jewish, Muslim, whatever. A lot of these debacles we’re seeing can be traced and sourced back to a lack of good old ethics,” said the Rev. Jerry Johnston, who this month launched a 12-part series of sermons on ethics at First Family Church in Overland Park, Kansas, which has about 5,000 members.

Johnston is one of a number of religious leaders and scholars who say the current spate of troubled times are an opportunity to lead more Americans into church pews and to prayer.

“We’re beginning to see this across the nation,” said Ken Eldred, a California technology company entrepreneur who writes books about the role of religion in business. “There has been a crisis of ethics … and I think sadly it is quite significant. People think business has nothing to do with faith, that honesty is not always the best policy. But when you take that away, people end up worse overall.”

For Full Article, see below:

Ethics crisis in America? Church leaders say yes | U.S. | Reuters.

How Jazz Helped Hasten the Civil-Rights Movement – WSJ.com.

By NAT HENTOFF

On Jan. 19, Martin Luther King’s Birthday, Jazz at Lincoln Center and the Rockefeller Foundation, also focusing on the next day’s presidential inauguration, will present at Kennedy Center “A Celebration of America.” Headlining the cast are Sandra Day O’Connor and Wynton Marsalis. As Jazz at Lincoln Center declares, Dr. King called jazz “America’s triumphant music,” and the presence of Mr. Marsalis is to “illustrate that American democracy and America’s music share the same tenets and embody the same potential for change, hope and renewal.”

This focus on jazz as well as President-elect Barack Obama (who, I’m told, has John Coltrane on his iPod) should help make Americans, including our historians, aware of the largely untold story of the key role of jazz in helping to shape and quicken the arrival of the civil-rights movement.

Or, “Your last name is Rice — are you related to Jerry? Condoleezza?”

In bolder moments, maybe after a few drinks at a cocktail party, a white acquaintance might say to George Rice, 45, who is biracial: “You don’t seem that black. I have no worries with you.”

The New Face of Race Relations – NYTimes.com.