The Boston Citgo sign, all 3,600 square LED feet of which has served as the backdrop to Red Sox games since 1965, is now officially a "pending landmark."

Spanish Surrealist Salvador Dalí spent much of the 1940s in the U.S., avoiding World War II and its aftermath. He was a well-known fixture on the art scene in Monterey, Calif. — and that's where the largest collection of Dalí's work on the West Coast is now open to the public.

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The middle of summer is when the surprises in publishing turn up. I'm talking about those quietly commanding books that publishers tend to put out now, because fall and winter are focused on big books by established authors. Which brings us to The Dream Life of Astronauts, by Patrick Ryan, a very funny and touching collection of nine short stories that take place in the 1960s and '70s around Cape Canaveral, Fla.

When the United Kingdom voted to leave the European Union last month, the seaside town of Port Talbot in Wales eagerly went along with the move. Brexit was approved by some 57 percent of the town's residents.

Now some of them are wondering if they made the wrong decision.

The June 23 Brexit vote has raised questions about the fate of the troubled Port Talbot Works, Britain's largest surviving steel plant — a huge, steam-belching facility that has long been the town's biggest employer.

Solar Impulse 2 has landed in Cairo, completing the penultimate leg of its attempt to circumnavigate the globe using only the power of the sun.

The trip over the Mediterranean included a breathtaking flyover of the Pyramids. Check it out:

President Obama is challenging Americans to have an honest and open-hearted conversation about race and law enforcement. But even as he sits down at the White House with police and civil rights activists, Obama is mindful of the limits of that approach.

"I've seen how inadequate words can be in bringing about lasting change," the president said Tuesday at a memorial service for five law officers killed last week in Dallas. "I've seen how inadequate my own words have been."

Mice watching Orson Welles movies may help scientists explain human consciousness.

At least that's one premise of the Allen Brain Observatory, which launched Wednesday and lets anyone with an Internet connection study a mouse brain as it responds to visual information.

The FBI says it is giving up on the D.B. Cooper investigation, 45 years after the mysterious hijacker parachuted into the night with $200,000 in a briefcase, becoming an instant folk figure.

"Following one of the longest and most exhaustive investigations in our history," the FBI's Ayn Dietrich-Williams said in a statement, "the FBI redirected resources allocated to the D.B. Cooper case in order to focus on other investigative priorities."

This is the first in a series of essays concerning our collective future. The goal is to bring forth some of the main issues humanity faces today, as we move forward to uncertain times. In an effort to be as thorough as possible, we will consider two kinds of threats: those due to natural disasters and those that are man-made. The idea is to expose some of the dangers and possible mechanisms that have been proposed to deal with these issues. My intention is not to offer a detailed analysis for each threat — but to invite reflection and, hopefully, action.


A Mind And A Man Worthy Of Adulation: Conrad H. Waddington

Feb 11, 2013

In the pantheon of scientists I have known and most admired, I hold high Conrad H. Waddington. His intellectual courage changed the shape of biology.

Waddington fundamentally extended the neo-Darwinian synthesis. Post-Newton, Charles Darwin is, to my mind, the mind that most altered the Western world view. His explanation of evolution through heritable variation and natural selection shifted everything.

But by the late 19th century, Darwin's theory was in deep trouble due to the idea of "blending inheritance." Briefly, if the factors of inheritance could vary continuously, breeding red-eyed and white-eyed flies should yield, eventually, a homogeneous population of uniformly pink-eyed flies. With this blending inheritance, heritable variation would wither and natural selection would have no heritable variation upon which to act.

Gregor Mendel's book lay unopened on Darwin's desk. Luckily for Darwin, it would save his theory. With the discovery in 1901 that chromosomal meiosis-forming egg and sperm cells obeyed Mendel's laws, the way opened to the hypothesis that the factors of inheritance were located on chromosomes. More, Mendel showed that these factors did not vary continuously, but, like the discrete "atoms of inheritance" he imagined, came in discrete, unblending, versions or alleles.

A red-eyed fly mated to a white-eyed fly yielded red-eyed progeny. But, when mating, these F1 flies yielded three red-eyed and one white-eyed F2 progeny. No blending here. Discrete variations appeared in the factors of heredity.

Using Mendel's laws, Ronald Fisher, J.B.S. Haldane and Sewall Wright invented population genetics. Their advance saved Darwin's theory from blending inheritance. A few decades later, this became the neo-Darwinian synthesis: evolution as the slow substitution by selection of a fitter version for a less-fit version of a gene set.

When sperm and egg fuse to form the zygote, a process begins that will lead to a newborn and then an adult. This is "developmental biology." To Fisher, Haldane and Wright, developmental biology was an intellectual afterthought that would take care of itself.

"No!," cried Waddington. He conducted a series of brilliant experiments and published telling books that surely shaped me as a scientist and thinker. If Fisher, Haldane and Wright united Mendel and Darwin, Waddington began the further union of population genetics and developmental biology. It is a fundamental union, for it is the developed phenotypes of organisms that are the subject of natural selection, not the heritable genes.

Waddington's central notion was that of the "epigenetic landscape," pictured as something like an unfolding set of valleys branching into further valleys, rolling downhill from the single cell type of the zygote to the hundreds of cell types and organs of the adult.

Waddington's early vision is now finding expression in systems biology. This growing field of study focuses on the genetic regulatory networks whose dynamics control ontogeny from the zygote onward.

So, I salute Waddington for his role in bringing us to this point, for uniting Mendel and Darwin with development, for pointing the way to the future.

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