A 4 min read In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact,...

A 5 min read A product that represents a clear technological advance over competing products can generally command a high price. Because technological advances tend to be quickly surpassed and companies want to make...

A 4 min read A comparison of the output of two spinning mills that produce woolen yarn—the Costello Mill and the Moorhead Mill—showed that the yarn from the Costello Mill had fewer flaws and greater strength. Since the Costello...

A 4 min read Parland’s alligator population has been declining in recent years, primarily because of hunting. Alligators prey heavily on a species of freshwater fish that is highly valued as food by Parlanders, who had...

A 5 min read Journalist: Every election year at this time the state government releases the financial disclosures that potential candidates must make in order to be eligible to run for office. Among those making the...

A 4 min read In an experiment, volunteers walked individually through a dark, abandoned theater. Half of the volunteers had been told that the theater was haunted and the other half that it was under renovation. The first half...

A 4 min read Charcoal from a hearth site in Colorado, 2,000 miles south of Alaska, is known to be 11,200 years old. Researchers reasoned that, since glaciers prevented human migration south from the Alaska-Siberia land bridge...

A 4 min read Asthma, a chronic breathing disorder, is significantly more common today among adult competitive swimmers than it is among competitive athletes who specialize in other sports. Although chlorine is now known to be a...