Early Photography in the United States     When photography first appeared in 1839 with the introduction of the daguerreotype, it was celebrated for revealing the truth ...

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...

Igloos   In the language spoken by the Inuit-an indigenous people inhabiting the Arctic regions of Canada, Greenland, and the United States-the word 'igloo' means 'house' or '...

Animal Migration Patterns in the Serengeti   The Serengeti, a region in northern Tanzania, is the site of the largest mammal migration on Earth. Herds of wildebeest, zebras...

The Proto-Indo-European Language     Scholars have known for several centuries that most of the languages spoken in a broad swath from Britain to India are derived from ...

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

Benefits of Migration Why do animals migrate? One obvious answer is to escape cold weather by moving to a warmer region. Each fall, millions of monarch butterflies migrate southw...

Currency and the Emergence of china's Market Economy 题目：     China's Song dynasty (960-1279 c.E.), building on developments of the earlier Tang dynasty(618-907 c.E...

    The Collision Model of the Moon's Formation       The collection and analysis of rocks brought back from the Moon during the Apollo spaceflight prog...

Were Dinosaurs Endothermic   题目： Because dinosaurs are considered reptiles, they were for many years thought to be cold-blooded (ectothermic) like modern reptiles, requiri...