More than halfway through Greg Bear's Moving Mars. There's a lot of slog. The characters don't seem very interesting, and as yet, nothing is really happening. Some brilliant kids on Mars discovered some brand new physics. It could be mindblowing.
Thing is Bear has already done the altered physics thing in other books like Anvil of Stars.
So far the threatened fallout seems to be interplanetary Solar System politics.
Bear's Martian society seems quite boring after the underground and demimonde of Mars Trilogy. Which reminds me, I'll read the concluding book Blue Mars after this, unless I decide on The Two Towers first.
Edit: I take back what I said about the book being boring. The final quarter of the book takes a flying leap into the abyss. Seemingly sane, therapied Earth launches a terrifying onslaught. However, which exact Earth faction was responsible for such a drastic escalation isn't made clear.
And the way the book ends, we'll never find out! Moving Mars is a very literal title!
This seems to be a tendency with Greg Bear, the story a bit slow and even bucolic until suddenly sheets hit the fan.