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Peter Godfrey-Smith, the author of “Theory and Reality: An Introduction to the Philosophy of Science,” has been thinking about how people can avoid the misunderstanding embedded in the phrase, “It’s only a theory.” Advertisement Continue reading the main story It’s helpful, he argues, to think about theories as being like maps.“To say something is a map is not to say it’s a hunch,” said Dr. Godfrey-Smith, a professor at the City University of New York and the University of Sydney. “It’s an attempt to represent some territory.”A theory, likewise, represents a territory of science. Instead of rivers, hills, and towns, the pieces of the territory are facts.“To call something a map is not to say anything about how good it is,” Dr. Godfrey-Smith added. “There are fantastically good maps where there’s not a shred of doubt about their accuracy. And there are maps that are speculative.”To judge a map’s quality, we can see how well it guides us through its territory. In a similar way, scientists test out new theories against evidence. Just as many maps have proven to be unreliable, many theories have been cast aside.But other theories have become the foundation of modern science, such as the theory of evolution, the general theory of relativity, the theory of plate tectonics, the theory that the sun is at the center of the solar system, and the germ theory of disease.“To the best of our ability, we’ve tested them, and they’ve held up,” said Dr. Miller. “And that’s why we’ve held on to these things.”

It seems that getting end-of-life patients and their families to endorse “do not resuscitate” orders has been challenging. To many ears, “D.N.R.” sounds a little too much like throwing Grandpa under the bus. But according to a paper in The Journal of Medical Ethics, when the orders are reworded to say “allow natural death,” patients and family members and even medical professionals are much more likely to give their consent to what amounts to exactly the same protocols.

After a law went into effect last summer banning obscenities in public performances, the playwright and director Ivan Vyrypaev excised the curse words from one of his plays, “The Drunks,” for its Russian debut at the prestigious Moscow Art Theater. Some actors played the new version straight, he said, while others winked to make clear what was cut.

MORAL quandaries often pit concerns about principles against concerns about practical consequences. Should we ban assault rifles and large sodas, restricting people’s liberties for the sake of physical health and safety? Should we allow drone killings or torture, if violating one person’s rights could save a thousand lives? We like to believe that the principled side of the equation is rooted in deep, reasoned conviction. But a growing wealth of research shows that those values often prove to be finicky, inconsistent intuitions, swayed by ethically irrelevant factors. What you say now you might disagree with in five minutes. And such wavering has implications for both public policy and our personal lives.

For a recent paper to be published in the Journal of Experimental Social Psychology, subjects were made to think either abstractly or concretely — say, by writing about the distant or near future. Those who were primed to think abstractly were more accepting of a hypothetical surgery that would kill a man so that one of his glands could be used to save thousands of others from a deadly disease. In other words, a very simple manipulation of mind-set that did not change the specifics of the case led to very different responses. Class can also play a role. Another paper, in the March issue of the Journal of Personality and Social Psychology, shows that upper-income people tend to have less empathy than those from lower-income strata, and so are more willing to sacrifice individuals for the greater good. Upper-income subjects took more money from another subject to multiply it and give to others, and found it more acceptable to push a fat man in front of a trolley to save five others on the track — both outcome-oriented responses.

Even the way a scenario is worded can influence our judgments, as lawyers and politicians well know. In one study, subjects read a number of variations of the classic trolley dilemma: should you turn a runaway trolley away from five people and onto a track with only one? When flipping the switch was described as saving the people on the first track, subjects tended to support it. When it was described as killing someone on the second, they did not. Same situation, different answers.

How the sound of your name shapes the way people think about you

Swearing, Stephens thinks, may be a form of pain management, maybe even empowerment. Last week, he and a colleague, David K. Spierer, of Long Island University, described a new study in which swearing seemed to bolster physical strength.