Agriculture arose independently in many locations throughoutthe world, and each time it was the result of people’s manipulating plants and animals that already lived around them. InAfrica this process happened numerous times in diff erent locations. Africa’s geography prevented the smooth transmissionof crops and livestock from place to place. As a result, peopleon the continent...

Thousands of years ago, before the existence of Egyptian civilization, the regions of North Africa that surround the Nile River were fertile grasslands and woodlands, providing farmland and grazing land for communities of people. Historians estimate that around 3500 b.c.e., however, the environment in these grasslands began to change dramatically, perhaps because of overgrazing of the land, and...

 Principles For Dealing With the Changing World Order: Why Nations Succeed and Fail Download by Ray Dalio. Download Principles For Dealing With the Changing World Order: Why Nations Succeed and Fail by Ray Dalio in PDF EPUB format complete free. Brief Summary of Book: Principles For Dealing With the Changing World Order: Why Nations Succeed and Fail by Ray Dalio Here is a quick...

A team led by scientists at Rensselaer Polytechnic Institute has 3D-printed hair follicles in human skin tissue cultured in the lab. This marks the first time researchers have used the technology to generate hair follicles, which play an important role in skin healing and function. The finding, published in the journal Science Advances, has potential applications in regenerative...