For those who like to misutilize a good deal of their valuable time thinking about space, time, velocity of light, trying to visualize 4 dimensions etc, "A Brief History of Time" by Stephen Hawking is a good read . Easy to read, comprehensible and targeted for ordinary users, it has been a classic and has tought most of our physics teachers most of what they know about space and time. The digital version can be accessed at: http://newton.physics.metu.edu.tr/~fizikt/html/hawking/A_Brief_History_in_Time.html Don't miss chapter 1 and 12. Go thru' remaining in your boredom.