Who invented Opera?

Opera: History, Facts, and Resources Who Wrote the First Opera? As opera became a sensation, the process of tracing its history back to a single work began;...

The Silk Road History

What was the Silk Road The Silk Road was the name given to a vast network of trade routes beginning in China and extending across...

Ilya Prigogine Biography

Belgian Theoretical Chemist, Famous for Irreversible Thermodynamics Brief biography of Ilya Prigogine, 1977 Nobel Prize winner in Chemistry, best known for development of irreversible processes...

Dr. William Buchan and Domestic Medicine

How One Book Revolutionized Family Medicine Colonial era medicine relied on a combination of local herbal remedies and European textbook cures, until William Buchan published...

The Scientific Revolution and Catholicism

New Thinking Challenged the Cosmological Order of the Church The Scientific Revolution and the subsequent Enlightenment offered radically different answers to long established Church tradition...

Sally Ride, Astronaut Biography

First American Woman in Space Aboard Orbiter Challenger Biography of American Sally Ride, astronaut and physicist, one of the first female astronauts in the U.S....

Ptolemaic Geocentric Astronomy

Ptolemy’s Geometric Devices Deferent, Epicycle, Eccentric, & Equant Ptolemy’s geocentric astronomical system used four geometric devices, the deferent, epicycle, eccentric, and equant, to explain the...

Newton’s Laws for Kids – Gravity

A Simple Explanation of the Law of Universal Gravitation Isaac Newton discovered three laws of motion and the law of gravity to explain motions observed...

Understanding Kepler’s Second Law

Planetary Motion, Changing Speeds, Equal Areas, and the Cosmos Kepler’s second law of planetary motion, expressed in terms of equal areas and equal times, means...