We observe closely related species in sympatry and infer how they evolved from a common ancestor.

Islands are known to differ in the food supply available to ground finches, mainly seeds.

To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life.

Evidence of epistasis from hybridization studies is more scarce.

Plumage features constitute a major component of courtship signals.

The theory of founder effects does not explain how novel features like plumage traits arise.

The process of speciation is completed with the cessation of genetic exchange.

Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals.

Males transmit signals in courtship through behavioral displays.

Thus mating of females was strictly along the lines of paternal song.

Species can be recognized by their morphological characteristics and songs.

Thus the genetic basis to the origin of bird species is to be sought in the inheritance of adult traits that are subject to natural and sexual selection.

We observe closely related species in sympatry and infer how they evolved from a common ancestor.

Genes that underlie the capacity to receive, use and transmit information are the evolving properties.

The divergence of songs in the new population away from those in the progenitor population would only be prevented if these processes were balanced by repeated immigration and subsequent breeding: song flow.

Closely related species of birds are also chromosomally similar.

Exchange of breeding individuals between two populations tends to homogenize their gene pools.

The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted.

Science is the acceptance of what works and the rejection of what does not. That needs more courage than we might think.

By putting downward pressure on interest rates, the Fed is trying to make financial conditions more accommodative - supporting asset values and lower borrowing costs for households and businesses and thus encouraging the spending that spurs job creation and a stronger recovery.

The wise does at once what the fool does at last.

Authors need to decide if they want to keep forever to themselves, or share forever with a publisher who takes over half the cover price.

Each day, I choose my age.

I think the most important leadership lessons I've learned have to do with understanding the context in which you are leading. Universities are places with enormously distributed authority and many different sorts of constituencies, all of whom have a stake in that institution.

The Bush Administration claims there is a Social Security crisis only to distract Americans from its serious mismanagement of the federal budget.

Crying is never a symbol of weakness. For the time we are born it has always been a sign that we are alive....

Obviously I'm not a violent person; I don't like violence, but I would definitely go into defending myself if the situation arose.

I just want you to know that, when we talk about war, we're really talking about peace.

I love video.

I've always been so apathetic. I figured, OK, maybe the world is going to fall down around me. Now I want to make a better world... that's motherhood.

Gratitude bestows reverence allowing us to encounter everyday epiphanies those transcendent moments of awe that change forever how we experience life and the world.

I like long walks, especially when they are taken by people who annoy me.

Being in love is the only transcendent experience.

I'm a child of the sixties. I grew up with a president who was a crook, who put us into the most unpopular war in history, who had no communication with people under thirty. I had seen the Symbionese Liberation Army and the Panthers and the Diggers; I understood what they were about.

I write the vocals last, because I wanted to invent the music first and push the music to the level that I had to compete against it.

He that won't be counseled can't be helped.

Mood disorders are terribly painful illnesses, and they are isolating illnesses. And they make people feel terrible about themselves when, in fact, they can be treated.

Self-discovery is so important in identity processing: who you hang out with, what clothes you wear, what shows you see. As a kid, I found out about things through friends. I would go to hardcore shows with 50 people.

If at first you don't succeed try, try and try again.

The greatest difficulty with the world is not its ability to produce but the unwillingness to share.

I want to not do anything I've done before. That can come in any form.

For the best part of my childhood I visited the local library three or four times a week, hunching in the stacks on a foam rubber stool and devouring children's fiction, classics, salacious thrillers, horror and sci-fi, books about cinema and origami and natural history, to the point where my parents encouraged me to read a little less.