题目： Transportation and Economic Change in the Nineteenth-Century       Between 1820 and 1860,the American economy entered a new stage of develop...

A Cat's Sense of Smell     题目： Cats have sensitive noses that they use for a variety of purposes, including finding mates and identifying the territory of other cats...

题目： Gordon Childe and the Neolithic Revolution   V. Gordon Childe (1892-1957) was one of the most influential archaeologists of the twentieth century, perhaps best known f...

Is Panspermia Possible 题目：   In 1996,NASA scientists claimed that Allan Hills 84001 (abbreviated ALH 84001),a meteorite containing materials ejected from Mars 15 million ...

  题目： Living-History Museums in the United States       The living-history approach to teaching social history combines restored or re-created historical ...

题目： Magma   Magma is a mixture of molten (melted)and semi-molten rock and other solids found beneath Earth's surface.Melting in Earth requires very specific conditions:the...

Lighting in Museums       The practice of reducing light exposure in museums was prompted by the publication, in 1978， of Garry Thomson's book, The Museum Environ...

The Collapse of Copán 题目：   The ancient Mayan kingdom of Copan, in what is now western Honduras, flourished for many years in the first millennium but declined sharpl...

  The Phenomenon of Hypnosis   题目：   Hypnosis is a process in which the person being hypnotized (the volunteer) demonstrates willingness to adopt suggestions by...

The Origin of Flight in Birds 题目： Debate over avian origins was stimulated in 1861 when the 150-million-year-old fossil of a bird-like creature was unearthed. Called Archaeopt...