What exactly "warps" when you are traveling at warp speed? What is the difference between the holodeck and a hologram? What happens when you get beamed up? Are time loops really possible, and can I kill my grandmother before I was born? Until now, fans of "Star Trek" were hard pressed to find answers to vital questions such as these. Now Lawrence M. Krauss, an internationally known theoretical physicist and educator, has written the quintessential…