I think that if parents do not know the answer to a question, they should look it up and learn it with the child. The whole internet is at their fingertips. It can become a learning experience for both the child and the adult.
I realize it's no longer a concern for parents now, but the vast majority of people who ever parented did not have access to the Internet. ARPA has been around since 1969, but the Internet has only been easily accessible to the masses since 1993 (when the Mosaic browser came out). This may seem shocking, but there are, in fact, Lesswrongers who did not have the Internet when they were children.
I recall my parents buying a set of Encyclopaedia Britannica around 1985 or so for a cost of around $400, which is about $840 dollars today -- not an expense everyone can afford.
So while it is, in general, a good idea not to provide mysterious answers to children's questions, it would not have been reasonable to expect parents to run to the library every time their child had a question they did not know the answer to, which is what this would actually have required only 1 generation ago.
Editing to add: Parents should also not be ashamed to answer "I don't know" to children's questions. This is much better than providing fake explanations.
True, I did not think of that. Now that I am looking back, attempting to remember, I do not believe we had a computer in the house until 1998.
Topic the First - Asking "Why?"
There is a certain cliche of a young child asking "why?", getting an answer, asking "why?" to that, and so on until the adult finally dismisses them out of frustration. And we all smile and laugh at how ignorant the child is and pat ourselves on the back for being so grown up.
But I don't think this story is very funny. This story, told in countless variations, has the rather repugnant moral that it is rude and childish to ask that most important of questions. "Why?"
So why do parents near-universally admonish their children when they persist with the questions? What is motivating parents all over the world to teach their children not to ask "why?"? Do parents simply not want to admit to their ignorance? I thought so at first, but I suspect it is deeper than that.
It seems more likely to me, that this practice is a defense against acknowledging that one's answers are mysterious. It is easier for a parent to attribute a young child's lack of understanding to a lack of intelligence, than to comprehend that their own answer is a curiosity stopper and not an answer at all.
In essence, children are being trained to accept curiosity-stoppers without hesitation, by being reprimanded for continuing to ask "why?" I find this more than a little alarming; it would seem that for parents in particular, it is especially dangerous not to notice when they're confused.
Topic the Second - The Behavior of Hope
Is tenuous hope more emotionally taxing than certain doom?
I wouldn't think so, but whenever the subject of death comes up (among those who don't believe in an afterlife) I've noticed a very curious pattern.
I have only a guess, but it seems possible that when doom is certain, when there's no escape for you or anyone, it is easier to numb the emotions. Accepting the possibility of escape makes the doom not-certain, which forces fear of the doom to the surface.
Topic the Third - Abuse of the word "Love"
On another site I happened to be perusing, someone posted a bit of a rant about teenagers not knowing the difference between love and lust, to which I gave this response:
* I define "real love" as the state of valuing another's quality of life more than your own quality of life.
Topic the Fourth - A "Good" Parent
Let's take a moment to think about how modern parents are generally expected to treat the subject of their offspring's sexuality. This is one of those things that I firmly believe any good future for humanity will look back on in horror.
With alarming commonality, adults with maturing offspring go out of their way to stunt their children's sociosexual development, due primarily, I think, to a desire to conform to the current societal archetype of Good Parent. Despite ambiguous-at-best psychological evidence, parents fight to keep kids ignorant, unequipped, and chaste due to the social consensus that having sexually active children makes one a Bad Parent.
I would even go so far as to call such deliberate impediment of sociosexual development a form of abuse, despite its extreme prevalence and acceptableness in today's world.