Five stars for content and presentation, less one star for depressing me.
The information is well researched and fascinating, wish I had written this one, just to have had the fun of learning it all from Bryson's sources. He connects seemingly unrelated threads in a clever way, keeping you wondering where he will be next.
HOWEVER, I would have been happier not knowing that Yellowstone could blow any day, destroying all life on the planet. (I was already aware of the comet threat, but the volcanic threat from Yellowstone seems more imminent, given the tilt of Yellowstone Lake.) This makes the bad news from the middle east really seem totally irrelevant by comparison.
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