Don Nardo

Discusses early theories on gravity, principles of how gravity works, and possible effects of gravity with regards to such phenomena as white dwarfs and black holes.

Next to the famous pyramids, Egypt is perhaps most famous for its rich and complex body of religious beliefs, customs and practices.

By the middle of the 1800s, the United States had become two separate societies. The North and the South were divided by vast economic, educational, and cultural differences. There was widespread misunderstanding and even hatred between the two regions of the country. But it was one specific issue--slavery--that would erupt in disaster.

Careers in renewable energy are among the fastest-growing occupations in the United States today. Comments from people in the industry, current statistics and forecasts, and realistic descriptions provide a useful look at renewable energy jobs, ranging from those in wind to solar to green construction.

"Describes the opposing viewpoints of women's suffragists and anti-suffragists in the United States beginning in the mid-19th century"-- Provided by publisher.

"Similarities between human reactions to onslaughts of deadly diseases separated by millennia illustrates the morbid universality of such outbreaks. It reminds us that large attacks of lethal germs are nothing new, nor are human reactions to them. One problem inherent in such pandemics is that over time people tend to forget the lessons of past"-- Provided by publisher.

"The historical tales Romans perpetuated were generally of two types. One consisted of foundation stories; other tales established their identity as a people. The types of historical tales dominating Roman mythology features heroes who were thought to have defended and/or saved Rome from hostile forces"-- Provided by publisher.

"Massive breakthroughs are changing the face of medicine and healthcare. In addition to the benefits of super-smart computers that can learn, medical researchers and doctors are beginning to reap the rewards of robots that perform surgeries. There have also been advances in nanotechnology-in which doctors heal by injecting microscopic particles into the body; using 3D printing to make replacements for failing bladders and other organs; and telemedicine,...