Nine out of 10 of you have probably used some variation of the term 'I'll never need any of this in the real world' when you were studying math in high school. True, the mechanics of long division and PEMDAS don't seem as important in day to day life...
The question to be answered is:
The book covers major questions about the nature and origin of the universe.
A small change to the theory of gravity implies that our universe inherited its arrow of time from the black hole in which it was born.
So, have a seat. Put your feet up. This may take some time. Can I get you some tea? Earl Grey? You got it.