The aim of this book is to continue to raise public awareness in the exciting field of theoretical physics and cosmology. It covers the latest theories at a level not weighed down by highly mathematical equations. Each chapter is written by a leading expert who is presently researching and lecturing on the topics. Extra Dimensions in Space and Time has two main features that differentiate it from all other books written about the topic: The first feature is the coverage of extra dimensions in time (Two-Time physics), which has not been covered in earlier books. All other books on the topic focus on extra spatial dimensions. The second feature deals with level of presentation. The material is presented in a non-technical language followed by additional technical sections (in the form of appendices or footnotes) that explain the basic equations and formulas in the theories. This feature is very attractive to readers who want to learn more about the theories involved beyond the basic description for a layperson.