THE BOOKThis is an important book on challenging problems in the scientific world, e.g., the interpretations of gravity, quantum entanglement, nature of light, etc., in the hard science of physics.Included are also the problems, and solutions, of the soft science of economics, wherein problems such as unemployment, inflation, etc., affect all and sundry, problems which must be tackled so that our lives would not be adversely affected.Like the author's other book on mathematical ideas, there are plenty of fresh insights to spur the reader to think further about the scientific ideas.THE AUTHORThe author has published many technical books and important research articles in mathematics and physics journals. He is also a university professor.