For many of those who didn't read numerous threads about it:
Curiosities now require something called Experience, which is different from Learning Points. Each curiosity has a cost associated with Experience to grant you Learning Points to acquire skills and increase abilities. Experience is only acquired from random events as you play your character, so being short on experience to study curiosities may cripple your character in the long run.
I'm not listing a full table here (unless requested), but I've found through research that the following curiosities have very low LP/EXP ratio (which means they give less Learning Points per experience given):
* Cone Cows
* Dandelions
* Bat Wings
This being said, Mirkwood Offerings have excellent LP/Hours, which means you'll get a lot of LP per hour. So if you have spare experience points, go ahead and use the offerings. The more Intelligence you have, the more the Experience drain will rise, so saving Experience may become a higher priority later on. Myself, I'm using offerings until I stay in the 1.5k~ experience mark. This means I have a stock of ~40 offerings ready to be used and when they're gone, I'll wait until expeirence rises again.
All curiosities with very few exceptions have a LP/EXP ratio of ~120-150. So you don't have to mind too much about the other curios. So far, the only "good" LP/EXP ratio curiosity which is fairly common is the Auroch's Hair.
Comments on other curiosities you find that have g