[Lib] Giraffe? NO
[Tuj] Primate? NO
[Chalky] Edible? NO! *considerable laughter*
[Rosie] Alive? YES

[Rosie] While I had heard the expression 'box of hammers' somewhere in the dim and distant past, enough for me to consider worth googling it for credibility before making my guess, you didn't actually have to have heard of it in order to get the answer. Besides, this game (as CdM once pointed out) is different from the original, and both google, self-education and working outside one's comfort zone are much more part of its fabric. If that makes it harder for those good at rote memorisation of canonical knowledge and easier for those good at on-the-fly research then perhaps that's an unhappy circumstance, but it is at least an index of changes in the world around us! I tend to think it's a good thing, myself, but then I have succesfully googled/guessed quite a lot lately. :) Definitely would concede, having tested it, that chronon was very hard to google up without a fair amount of specialist knowledge and probably therefore inappropriate, but a box of hammers is a concept available to anyone who's heard of hammers and boxes. That said, I would say that my current one shouldn't require google (unless someone asks the wrong question, causing me to give a truthful but obscure and therefore counterintutive and hard-to-synthesise fact about the subject under question).

(Not that there's such a thing as a 'wrong' question in this game, obviously)

[Tuj] Specific, unique? NO