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A puzzlement. Why, I wonder, are both these things true? There is an animal, a wee little thing, the size of a poppy seed, that lives in lakes and rivers and eats whatever flows through it; it's called a gastrotrich. It has an extremely short life. Hello, Goodbye, I'm Dead It hatches. Three days later, it's all grown up, with a fully adult body "complete with a mouth, a gut, sensory organs and a brain," says science writer Carl Zimmer. In 72 hours it's ready to make babies, and as soon as it does, it begins to shrivel, crumple ... and usually within a week, it's gone. Dead of old age. Sad, no? A seven-day life. But now comes the weird part. There's another very small animal (a little bigger than a gastrotrich) that also lives in freshwater ponds and lakes, also matures very quickly, also reproduces within three or four days. But, oh, my God, this one has a totally different life span (and when I say totally, I mean it's radically, wildly, unfathomably different) from a gastrotrich. It's a hydra. And what it does — or rather, what it doesn't do — is worthy of a motion picture. So we made one. Well, a little one. With my NPR colleague, science reporter Adam Cole, we're going to show you what science has learned about the hydra. Adam drew it, animated it, scored it, edited it. My only contribution was writing it with him, but what you are about to see is as close as science gets to a miracle.

"In 1941, sadness is at its peak," Bentley says.

Which brings us to the most surprising finding of the study: We think of modern culture — and often ourselves — as more emotionally open than people in the past. We live in a world of reality television and blogs and Facebook — it feels like feelings are everywhere, displayed to a degree that they never were before. But according to this research, that's not so.

In universities around the world, semesters end with students filling out similar surveys about their experience in the class and the quality of the teacher. Student ratings are high-stakes. They come up when faculty are being considered for tenure or promotions. In fact, they're often the only method a university uses to monitor the quality of teaching. Recently, a number of faculty members have been publishing research showing that the comment-card approach may not be the best way to measure the central function of higher education.

With so many pressing human needs, the logic goes, there's no room for compassionate action toward nonhuman animals. The underlying assumption is that being good is a zero-sum game, with gains for one cause — in this case, animal welfare — coming at the expense of another — in this case human welfare.

The zero-sum assumption may be compelling because it's buoyed by a few features of human psychology.

Doing something is better than doing nothing, even when that something is a small and imperfect step toward a tertiary goal.

He and his colleagues launched the FastTrack Project to see if they could change students' life trajectory by teaching them what researchers like to call social-emotional intelligence. Back in 1991, they screened 5-year-olds at schools around the country for behavior problems. After interviewing teachers and parents, the researchers identified 900 children who seemed to be most at risk for developing problems later on. Half of these kids went through school as usual — though they had access to free counseling or tutoring. The rest got PATHS lessons, as well as counseling and tutoring, and their parents received training as well — all the way up until the students graduated from high school. By age 25, those who were enrolled in the special program not only had done better in school, but they also had lower rates of arrests and fewer mental health and substance abuse issues. The results of this decades-long study were published in September in the American Journal of Psychiatry. The findings prove, Dodge says, "In the same way that we can teach reading literacy, we can teach social and emotional literacy."

A newly published paper suggests that personality similarity affects teachers' estimation of student achievement. That is, how much you are like your teacher contributes to his or her feelings about you — and your abilities. "Astonishingly, little is known about the formation of teacher judgments and therefore about the biases in judgments," says Tobias Rausch, an author of the study and a research scientist at the Otto-Friedrich-Universität Bamberg. "However, research tells us that teacher judgments often are not accurate."

For example, a recent study from Israel showed that teachers gave girls lower grades on math tests when they knew their gender. And lots of researchers have looked at the importance of having teachers who share the racial and socioeconomic backgrounds of their students.