I was reading and attempting to understand Max Tegmark's research on the multiverse, and I found this: http://science.howstuffworks.com/quantum-suicide.htm Now, while How Stuff Works is generally a good site, there are some areas that they could have been clearer on. The paragraph [Aren't there other aubatomic particles other than quarks?] I always thought that the spin of a particle does not mean the particle is spinning like a top in physical space, but refers it as intrinsic angular momentum. The mathematics behind it behaves (I think) a lot like "normal" angular momentum of a top spinning but from what I have read, that is not what is meant by spin. I also have heard that it is impossible to measure its spin due to confinement. Also, if the universe has a consistent basis on the same mathematical laws, then other variables can't be changed. Otherwise, the whole laws of mathematics would be off. In other words, if the universe has a progressive time which could be equated to a math problem being worked out, then even the smallest problems would have to obey the rules of the biggest problems. Correct? I seem to fail to understand how this would apply to humans and their decisions, since the MWI only applies to subatomic particles. Any insight?