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Comment Re:Flawed assumptions. (Score 1) 686

No. Neither is stable.

It is pretty easy to see. Imagine the sphere moving a tiny amount so the star is no longer at the center of the sphere. Now the question is, do the resulting gravitational forces pull the sphere back towards the position where the star is at the center, or do they pull the sphere further off-center? Clearly, they are now unbalanced in favor of pulling the close side of the sphere even closer and, thus, sphere-world is also unstable.

Comment Re:But that's not the real problem. (Score 1) 1651

I don't know a single person that doesn't bike because they have to wear a helmet.

Well, you don't know me personally. But you now know OF someone who doesn't bike because of helmets.

My whole family has bicycles and helmets. The bikes are right out on the patio ready to go. But whenever I suggest that we go for a ride, we realize that we have to dig out the helmets, adjust the straps and what-not, and by then it all seems like too much hassle. So the bikes have been out there on the patio all summer and we haven't ridden once. Last summer, same thing. Summer before, same thing.

Our kids never go out to ride them either because dealing with the helmet is a pain.

I've got a daughter who is eight years old and doesn't know how to ride a bike primarily because of the insane belief that it's dangerous to ride a bicycle around the park without a helmet.

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