Well, this business of extra dimensions is getting interesting. The author has included dead end research projects which looked promising at the beginning but only turned to dust after much hard work. That way it reads like a murder mystery, never knowing where it will end. I get up each morning an hour earlier just to get some reading in before I meditate. And I can understand what she's writing about. It makes sense when you read it. We reside in one brane and the full force of gravity resides on an adjacent brane. These branes can only communicate by transiting through the 5th dimension (three of space, one of time and the 5th (extra) dimension). But the gravity is subject to an exponential loss as it travels through the 5th dimension which results in a very low value of gravity by the time it reaches our brane. It's obvious when you think about it. All one needs to know is that a brane is like a tiny sheet on which fundamental particles (and hence, us) live.
Extra dimensions are hidden proof that we're all on this flight together.
Dick
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