Brazilian archaeologists have discovered a vast number of 2,000-year-old rock carvings that depict human footprints, celestial-body-like figures, and representations of animals, such as deer and ...

There has been much confusion in regard to recent prophecies on a Third World War. There has been warning that it would occur if not enough conversion of mankin ...

the stability of Lagrange points in the three-body problem, and lunar motion. More than 100 exercises allow students to gauge their understanding, and a solutions manual is available to instructors.