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If you write about genetics and evolution, one of the commonest questions you are likely to be asked at public events is whether human evolution has stopped. It is a surprisingly hard question to answer.

human evolution

I’m tempted to give a flippant response, borrowed from the biologist Richard Dawkins: Since any human trait that increases the number of babies is likely to gain ground through natural selection, we can say with some confidence that incompetence in the use of contraceptives is probably on the rise (though only if those unintended babies themselves thrive enough to breed in turn).

More seriously, infertility treatment is almost certainly leading to an increase in some kinds of infertility. For example, a procedure called “intra-cytoplasmic sperm injection” allows men with immobile sperm to father children. This is an example of the “relaxation” of selection pressures caused by modern medicine. You can now inherit traits that previously prevented human beings from surviving to adulthood, procreating when they got there or caring for children thereafter. So the genetic diversity of the human genome is undoubtedly increasing.

Or it was until recently. Now, thanks to pre-implantation genetic diagnosis, parents can deliberately choose to implant embryos that lack certain deleterious mutations carried in their families, with the result that genes for Tay-Sachs, Huntington’s and other diseases are retreating in frequency. The old and overblown worry of the early eugenicists—that “bad” mutations were progressively accumulating in the species—is beginning to be addressed not by stopping people from breeding, but by allowing them to breed, safe in the knowledge that they won’t pass on painful conditions.

Still, recent analyses of the human genome reveal a huge number of rare—and thus probably fairly new—mutations. One study, by John Novembre of the University of California, Los Angeles, and his colleagues, looked at 202 genes in 14,002 people and found one genetic variant in somebody every 17 letters of DNA code, much more than expected. “Our results suggest there are many, many places in the genome where one individual, or a few individuals, have something different,” said Dr. Novembre.

Another team, led by Joshua Akey of the University of Washington, studied 1,351 people of European and 1,088 of African ancestry, sequencing 15,585 genes and locating more than a half million single-letter DNA variations. People of African descent had twice as many new mutations as people of European descent, or 762 versus 382. Dr. Akey blames the population explosion of the past 5,000 years for this increase. Not only does a larger population allow more variants; it also implies less severe selection against mildly disadvantageous genes.

So we’re evolving as a species toward greater individual (rather than racial) genetic diversity. But this isn’t what most people mean when they ask if evolution has stopped. Mainly they seem to mean: “Has brain size stopped increasing?” For a process that takes millions of years, any answer about a particular instant in time is close to meaningless. Nonetheless, the short answer is probably “yes.”

I say this for two reasons. First, it’s clear, from glancing around society, that clever people—who on average have slightly bigger brains—aren’t having more babies than less-clever people. Second, the fossil record strongly suggests that our brain size peaked at 1,500 cubic centimeters around 20,000 years ago and has since shrunk to 1,350 cc.

This neither worries nor surprises me.

We ceased relying upon individual brain power tens of thousands of years ago. Our civilization now gets all its inventive and creative power from the linking of brains into networks. Our future depends on being clever not individually, but collectively thus, the next evolutionary stage for mankind isn’t physical but mental.

thnx tmn

 

you are the universe experiencing itself!

you are the universe expe…

babi registry!

May 24, 2012 — 2 Comments

FINALLY the babi registry is complete!  *I* selfishly want the travel system!  Essentially it’s a baby stroller that looks like it can go FAST and the car seat can mount inside of it!  I’m gonna put on a super charger and racing stripes!  Oh and I have a baby racing helmet on the way too :)

snowden stroller

Schweeet!

Anyway, here is a link to the registry: #teamsnowden

Any contributions that can be provided in respect to our little one, will be infinitely appreciated. If nothing else, warm thoughts and love will do :)

#teamsnowden

walk away…

May 23, 2012 — Leave a comment

In any kind of negotiation, your ability to walk away is your strongest tool.

Those who can walk away from the negotiation — legitimately walk away, not just make a show of it — are in the strongest position. Those who are convinced they need to make the deal are in the weakest position.

walk away

This is true of negotiating when you’re buying a car, closing the sale of your new home, haggling in a foreign flea market, or trying to get a raise.

It’s also true of anything in life.

Know that there’s almost nothing you can’t walk away from.

If you are convinced you need a nice house with a walk-in closet and hardwood floors and a huge kitchen, you now have a weakness. You will give away precious life hours and savings to get it. Someone else who knows that those things aren’t absolutely necessary can walk away, and not need to spend so much money (and thus work hours) on that kind of house.

If you are convinced that you need Stabucks grande lattes every day, or an iPhone or iPad, or an SUV or BMW … you are in the weak position, because you can’t give it up. Someone else might know that those aren’t essential to happiness, and can walk away.

If you know that the person who is treating you badly (but who you just know will change someday, because, you know, they love you) isn’t necessary for you to be happy, you can walk away. If you know that you can be happy alone, and that you need no one to make you happy, you can walk away.

If you know that there’s almost nothing you can’t walk away from, you can save yourself tons of money. Years of time. Mountains of headaches and heartaches.; and boatloads of suffering.

If you know that there is a chasm between your beliefs and some semblance of happiness, then you should walk away from said beliefs and re-evaluate them.  We tend to think that we always need to walk away others, when sometimes, we need to walk away from ourselves.  Don’t become too rigid in thinking that your beliefs are the end all be all.  Sure, you were taught them and some you’ve adopted from others – but like all things, they have a time and purpose and things must change.  After all, beliefs aren’t really yours – they are someone else’s that you’ve agreed to.

You don’t need to walk away from everything, but you should know that you can and that just as fluid as the motion of walk itself is, so is life.  Be fluid, be flexible and live!

thanks ep!

U.S. minorities now represent more than half of America’s population under the age of 1, the Census Bureau said, a historic demographic milestone with profound political, economic and social implications.

The bureau — defining a minority as anyone who is not “single race white” and “not Hispanic” — released estimates on Thursday showing that 50.4% of children younger than 1 were minorities as of July 1, 2011, up from 49.5% from the 2010 Census taken in April 2010.

“2011 is the first time the population of infants under age 1 is majority minority,” said Robert Bernstein, a Census Bureau spokesman.

The latest statistics — which also count the national population younger than 5 as 49.7% minority in 2011, an increase from 49% in 2010 — portend a future of a more racially diverse America, with new and growing populations playing more important roles politically and economically in years to come, analysts say.

Like other analysts, Kenneth M. Johnson, senior demographer at the Carsey Institute and professor of sociology at the University of New Hampshire, isn’t surprised at the trend.

“We’ve known it was going to come, but the question was what year the “crossover point” would happen, he said.

“Little children are in the vanguard of all this change coming to America.” he said.

Johnson sees the trend as an opportunity for more Americans to embrace diversity. More children are going to be exposed to a more diverse group of classmates, and that will affect attitudes and outlook.

The changes are going to be felt first in hospitals, as well as schools, where an increasingly diverse child population has to be absorbed. Hospitals would need interpreters and translators, for example, Johnson said. English as a second language would be an educational priority.

While many regions such as Atlanta have a diverse population, other regions lack racial and ethnic variety and will have to deal with a new kind of population, he said. In declining rural counties, he said, an influx of groups like Hispanics would serve to renew communities and changes would ensue.

“For a country that’s aging, we need young workers, and the growth of the minority population will contribute to the size of the young adult workforce,” he said. “This is breathing new life into the United States.”

Jeff Passell, senior demographer at the Pew Hispanic Center, called the Census numbers “a cumulative effect of 35 to 40 years of immigration” bringing large numbers of Latinos, Asians and other immigrants into the United States.

He said the Hispanic population in particular is very young, much more concentrated in child-bearing years, and has a higher fertility rate than the white, non-Hispanic population. Lately, he says, there are a lot more births among native Hispanics in the United States than new Hispanic immigrants, a “cumulative effect” of immigration.

If the trend continues, Passell says several decades from now, possibly in the late 2030s or early 2040s, the U.S. population will become less than 50% non-Hispanic white.

“This is a trend that we can reasonably expect to continue. The factors that determine this have been set into motion, and in demography things tend to change gradually,” he said.

There were 114 million minorities in 2011, or 36.6% of the U.S. population, a bump of half a percentage point from 2010. The latest figures count Hispanics as the most populous and fastest growing minority group.

They numbered 52 million in 2011, and their population grew by 3.1% since 2010. The U.S. Hispanic population grew from 16.3% in 2010 to 16.7% in 2011.

“California had the largest Hispanic population of any state on July 1, 2011 (14.4 million), as well as the largest numeric increase within the Hispanic population since April 1, 2010, (346,000),” the Census said.

“New Mexico had the highest percentage of Hispanics at 46.7%. Los Angeles had the largest Hispanic population of any county (4.8 million) in 2011 and the largest numeric increase since 2010 (73,000). Starr County — on the Mexican border in Texas — had the highest share of Hispanics (95.6 percent).”

Asians numbered 18.2 million nationally in 2011, making them the second fastest-growing minority group — up by 3% since 2010. Figures show that California had the largest Asian population of any state at 5.8 million and the largest increase since 2010 at 131,000.

“Hawaii is our nation’s only majority-Asian state, with people of this group comprising 57.1% of the total population. Los Angeles had the largest Asian population of any county (1.6 million) in 2011, and also the largest numeric increase (16,000) since 2010. At 61.2%, Honolulu had the highest percentage of Asians in the nation,” the Census said.

African-Americans are the second largest minority group in the United States at 43.9 million in 2011, an increase of 1.6% from 2010. New York has the largest black population of any state with 3.7 million and Texas has the largest increase from 2010 of 84,000. Cook County, Illinois, which includes Chicago, has the largest black population of any county at 1.3 million. Fulton County, Georgia, which includes Atlanta, has the largest increase since 2010 at 13,000.

The District of Columbia has the highest percentage of blacks at 52.2%. Mississippi has the second-largest at 38%.

America’s native population — labeled “American Indian and Alaska Native population” by the Census — was about 6.3 million in 2011, up 2.1% from 2010. California had the largest such population at 1,050,000 and the largest increase at 23,000. Alaska had the highest share at 19%. Los Angeles had the largest such population of any county, with 231,000, and the largest increase, 9,000 since 2010.

The population classified as “Native Hawaiian and Other Pacific Islander” was 1.4 million in 2011, up 2.9% since 2010. Hawaii had the largest such population of any state at 359,000 and the highest percentage at 26.1. California had the largest increase since 2010 at 9,000. Honolulu has the largest population of any county at 235,000. Los Angeles County had the largest increase since 2011 at 2,700.

Of single race non-Hispanic whites, California had the largest population at 15 million. Texas had the largest increase since 2010 at 80,000. Maine had the highest percentage of the non-Hispanic white alone population, 94.3 percent.

Four states and the District of Columbia have predominantly minority populations, Hawaii, at 77%, the District of Columbia at 64.7%, California, at 60.3%, New Mexico, at 59.8%, and Texas, at 55.2%. Minorities comprised the majority population in 11% of the nation’s 3,143 counties.

Michael White, professor of sociology at Brown University, said the rise of minorities fits into a longer-term evolution of the U.S. population, a mosaic that has been adapting to ethnic change since the first Census was recorded in 1790. There have been many groups represented over time, from enslaved and indigenous peoples, those of European stock, and now to a population reflecting the wider world — truly a “melting pot,” he said.

White says it’s hard to say how the changes will affect politics and that one can’t assume that ethnic patterns will determine voting patterns. Local economic issues, for example, will evolve differently in different states and cities, and there are economic benefits of having a younger population, he said.

“The political dimensions will play out differently,” he said. And by the time the babies are old enough to cast ballots, “the United States will be a different place when they are walking into a voting booth.”

William Frey, Brookings Institution demographer, sees political challenges for new immigrants and an economy benefiting from their presence. Many Hispanics and Asians are too young to vote or can’t cast ballots because they haven’t become citizens.

“It’s going to take perhaps awhile before the younger people get more engaged in politics. They do have an impact in some places, like swing states, such as Nevada, Colorado and Florida. They can make a difference,” he said.

He, too, says that newcomers to the United States bring an energy that invigorates the economic system and an older society.

“I think we’re going to just see that the younger part of the population will have a different vibe,” he said. “They are sort of needed to help our youthful image and to add to that vitality. They will bring a dimension and element we sorely need.”

To see how race breaks down in your area, click this link! http://projects.nytimes.com/census/2010/explorer?ref=us