: A few examples: -Librarian can apparently plan the course of evolution over
: many generations. There is in fact no roadmap to evolution, and no way for
: there to be one without invoking divine power. Populations of organisms
: change over time in response to their environment, with characteristics
: that improve survival being more likely to be passed down. But since
: populations are adapted for their specific environmental circumstances,
: there is no such thing as being higher or lower evolved. There is only
: ideal adaptation to a particular environment, and environments change all
: the time. So unless Librarian is manipulating climate conditions on Earth
: or something, her guiding of evolution is nonsensical. I certainly don't
: see how "guiding" evolution would let her plant the idea to
: invent Mjolnir and Cortana, which she implies in Halo 4.

: -Librarian can "accelerate" the Chief's evolutionary journey. I
: don't know what an evolutionary journey is, but evolutionary changes do
: not occur on the level of an individual within their
: lifetime...incremental changes that prove beneficial are passed on to
: offspring. Changing something in the Chief instantly to make him immune to
: the Composer isn't biology, it's magic.

I don't disagree with you entirely, which is why I'm just doing these two quotes.

We use words like "in fact", and I must say, from my evolving journey reading research and learning, I've learned that we currently, as a human race, still don't know anything. We only think we do. If something is labeled as a fact, it is not a never-changing wall -- facts have been challenged and changed many times before.

For example, recently scientists found that we can be below 0 degrees Kelvin. Check out the half-life of facts. Is everything that came out of Einstein's mouth the most absolute truth? Or is it just what seems to be fact from our current understandings of the universe?

I encourage sci-fi stories, especially when we're dealing with advanced races such as the Forerunners and Precursors, to continue their "that can't happen" ideals, because otherwise why add "fiction" at the end of the science? Many things we deem impossible may later showcase a probability. Having this mindset, seeing advanced fictional races operate with "hard light" technology, floating colossal sized structures, and playing with evolution becomes such a ride because it's a constant "But, how? That's not possible!"

Which is how I expect to react when reading on advanced alien races.