It is now generally accepted that dinosaurs (and large numbers of other animals and plants) went extinct about 65 million years ago, when Earth was hit by a giant asteroid (a rocky...

TF阅读真题第683篇The Solnhofen limestones and Archaeopteryx

TF阅读真题第728篇Europe's Economic Recovery in the Fifteenth Century

TF阅读真题第705篇Freehold Society in Colonial New England

TF阅读真题第684篇Escape Mechanisms of Ypsolopha Dentella

Woody plants produce a great variety of chemical compounds to provide protection against other plants, diseases, and herbivores (plant-eating animals) big and small. These chemical...

By the twentieth century, making workers more “cost-efficient” had become the single most important management goal in large-scale industries. Everywhere in industrial America ma...

TF阅读真题第688篇Uniformitarianism and Earth's Cycles

TF阅读真题第691篇Natufians and the Domestication of Grain

The growing population of eighteenth-century Europe increased demand for cloth to clothe people. Urban merchants turned to rural people for additional, inexpensive labor: farming f...