According to string theory, there is another dimension only trillionths away from the one we are in and it probably has a different history. Yeah; and there are suppose to be 11 of them....including ours of course.
String theory makes me feel like I can pass a string in one ear and out the other without disturbing anything.
Yeppers, Brian Greene has a couple of good books out.
Also Lee Smolin's book is good. "Three Roads to Quantum Gravity."