Resources exist to be consumed. And consumed they will be, if not by this generation then by some future. By what right does this forgotten future seek to deny us our birthright? None I say! Let us take what is ours, chew and eat our fill.

A Level 1 parallel universe is just a region of the universe that is outside of our Hubble bubble and thus unobservable. It has nothing to do with the type of multiverses being discussed.

One of the website I check every morning is the daily Arctic sea ice extent.

http://nsidc.org/arcticseaicen...

And I have a really good feeling that this will be the year that humanity finally gains the upper hand in our millennial struggle against the Arctic ice cap. Once the ice cap melts completely, even temporally, it will shift the equilibrium of seasonal oscillations. Every winter it will freeze a little less; every summer it will thaw a little sooner. Until our final victory is inevitable. Congratulations everyone. And keep up the good work.

And I can't believe that someone at least educated enough to name drop perturbation theory thinks that numerical methods are anything other than an approximation. In many cases, approximations are a useful solution, but you can NOT solve an arbitrary set of differential equations with absolute accuracy using numerical methods which would be a requirement for a true simulations of reality. And your own link the Church-Turing-Deutsch thesis acknowledges it as being incompatible with classical computers and only speculative regarding quantum computers.

You're talking about a very common homework problem in almost every introduction to quantum classes. THose same quantum classes should have taught to the limitations of the approximation.
https://web.stanford.edu/group...
Just go ahead and skip to slides on experimental error. Perturbation Theory gives you a nearly about a 2% error from experimental values even for the simplest properties of the simplest systems. This is not convincing evidence that reality can be modeled using simple differential equations on classical computers.

If the simulated brain is working in a simulated lab and conducting simulated experiments, then the simulation still need to capable of computing all of the physics required to simulate Life, the Universe and Everything.

How did you deal with the correlation and exchange between the two electrons? You probably used some approximation that only works because helium can be assumed to be non-reactive. As soon as one of those electrons gets moved from a ground state S orbital, your numerical simulation would start to fall apart. These issues cannot be waved away as a "complexity" problem; these equations have existed since before digital computers and the solutions for non-trivial problems still allude us. The TFA addresses this when she points that that quantum mechanics will never be accounted for by a classical computer.

Heck, all of physics we know can be simulated even in a classical computer, they are just differential equations

Spoken like someone who has never actually tried to simulate those differential equations for an non-trivial problem. Those simple equations, like the Schrodinger equation, become mathematically intractable as soon as you simulate something more complex than a hydrogen atom.

An equation is only a mathematical description of a model. Even once you have the equation, there is no particular guarantee that a solution is computable.

So you're making the same argument as Intelligent Design advocates. You're saying that because an artist can paint a realistic representation of a sunset, that the real sunset must have been "painted" by an artist too.

it is very likely that an advanced civilization would have the ability to run very accurate simulations

That is an unfounded assumption. You're taking a mere 50 years of computational progress and extrapolating to infinity. But there are physical limitations to computational density and mathematically intractable problems (like the many-body problem) that don't go away no matter how many iterations of Moore's law that you throw at them. Even simple, well-defined sets of differential equations, like the Navier–Stokes equations, are a struggle to simulate.

You've got it backwards. If a state were to choose to leave and was willing to negotiate mutually agreeable terms, who would pick up arms to stop them? By 1988, even the Soviets weren't willing to use force to oppose popular secessionist movements. You have a low opinion of the US government if you think they would be more tyrannical the Soviets.

No need for a civil war if both sides think they'd be better off without the other.

It is very generous of Richard Branson to offer a free flight on his imaginary spaceship. And to do so in such a discreet manner surely means this is not a ploy get free headlines for his struggling company.

But if you already have a full-time job that covers your cost of living, then driving for Uber part time gives you an extra $600/month in your pocket after expenses. Is there no room in your structured economy for people willing to work extra to earn extra income?

I'll never understand why local law enforcement, like Palm Beach and NYC, would spend extra funds on protecting the President without receiving compensation. Make the President fund protection from his own budget or let him fend for himself.

Anyone can hold the helm when the sea is calm. -- Publius Syrus