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Some archaeologists speculate that the Americas might have been initially colonized between 40,000 and 25,000 years ago. However, to support this theor...
A critical consensus has emerged that Mary McCarthy will be remembered primarily as an essayist rather than as a novelist. But despite her formidable...
MacArthur and Wilson suggested that the biodiversity of an island will vary in direct proportion to a function of the island’s size (i.e., larger i...
Most seismologists assume that following a major earthquake and its aftershocks, the fault (a break in Earth’s crust where pressure can trigger an ...
Hotter and more massive than the Sun, stars called “stragglers” are puzzling to astronomers because such rapidly burning stars would not be expected...
Some researchers claim that cetaceans—whales and dolphins—have culture, which the researchers define as the ability to learn from one another. Skeptic...
When Earth formed 4.6 billion years ago, the Sun burned only 70 percent as brightly as it does today. Yet Geologic record contains no evidence for...
Biologist know that some marine algae can create clouds by producing the gas dimethyl sulphide (DMS), which reacts with oxygen in air above the sea...
There have long been dead zones—water too low in oxygen to sustain most forms of life—in the Gulf of Mexico, which receives the waters of the M...
Benjamin Franklin is portrayed in American history as the quintessential self-made man. In “Self-reliance”, Emerson asks, “Where is the master who c...
The finding that there were rock-melting temperatures on asteroids for sustained periods is puzzling: asteroids’ heat source is unknown, and unlike p...
In 1919 Britain experienced its largest ever reduction in industrial working hours, to 48 per week. In Dowie’s view the 48-hour week played a centr...
Prominent among theories of the function of sleep is Meddis’ immobilization hypothesis, which holds that sleep, rather than serving a restorative func...
Many researchers attribute the large number of physiological and behavioral similarities between birds and mammals, which have separate evolutionary his...
Feminist scholars have tended to regard women in the nineteenth-century United States who elected to remain single as champions of women’s autonomy a...
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