A document of extraordinary importance for the American statehood is the Declaration of Independence published on the fourth of July 1776,written by Tomas Jefferson,with...
Sound-producing sand avalanches
Sound-producing sand grains constitute one of nature’s more puzzling and least understood physical phenomena. They occur naturally in two distinct types: booming...
X. The Portuguese Empire
The Portuguese Empire , also known as the Portuguese Overseas, was one of the largest and longest-lived empires in world history and...
Background
Before establishing the colonies of Jamestown and Plymouth,the English had an attempt to establish a colony on Roanoke Island.They hoped it would be the...
What is Alchemy ?
Alchemy was not merely misguided chemistry; it made many contributions to chemistry. Alchemy was, however, a magical or mystical way of...
Early Surgery
Surgery is perhaps the oldest form of medicine. The practice of making holes in the skull, or trephining, is prehistoric, while one of...
The city of Carthage in North Africa (modern-day Tunisia) was the capital of the Carthaginian empire that controlled parts of the Mediterranean from the...
