Children in two-parent families spend more time with their mothers and fathers now than they did 20 years ago. (p. 312)

Mammal species exhibit basic types of brain design from which they have evolved a wide array of brain sizes, according to a new analysis. (p. 312)

A substantial proportion of children in grades 6 through 10 report bullying other children or being bullied themselves. (p. 280)

Brain areas considered crucial for understanding language may also play an important role in music perception. (p. 280)

Layers of hardened volcanic ash on the Indonesian island of Java have yielded evidence that Homo erectus reached eastern Asia by 1.5 million years ago and remained there until about 1 million years ago. (p. 246)

The skeletal diversity that many scientists use to divide up fossil species in our evolutionary past masks a genetic unity that actually encompassed relatively few species, contend researchers in an opposing camp. (p. 232)

Large-scale changes in climate and habitats may have sparked the evolution of many new animal species in Africa beginning 7 million to 5 million years ago, including a string of new species in the human evolutionary family. (p. 232)

Scientists have for the first time linked high levels of retroviral activity in the central nervous system to some cases of schizophrenia, a severe mental disorder. (p. 228)

Prehistoric human skulls found in Brazil share some traits with modern Africans, leading a Brazilian scientist to theorize that Africans rather than Asians first arrived in the Americas sometime before 11,000 years ago. (p. 212)

Although dyslexia involves a common disruption of reading-related brain activity, the reading performance of people with dyslexia appears to improve if they use a language that has consistent spelling rules. (p. 205)

In a community sample, people suffering from moderate to severe depression exhibited an elevated death rate from heart disease over a 4-year study period, even if they had no discernable heart disease to begin with. (p. 205)