A stencilled outline of a hand found on the Indonesian island of Sulawesi is the world's oldest known cave painting, researchers say. It shows a red outline of a hand whose fingers were reworked, ...

Peter Gratton, Ph.D., is a New Orleans-based editor and professor with over 20 years of experience in investing, economics, and public policy. Peter began covering markets at Multex (Reuters) and has ...

Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ideas such as energy, mass, particles and waves. Physics attempts ...