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The Illuminating Curiosity is an item added by Thaumcraft 6. When used, it will add 50-100% observation progress and 33-50% theory progress in Infusion, as well as 50-100% observation progress and 33-50% observation progress in a random category. It can be also used in theorycrafting for 25-30 Infusion progress.
It can be obtained by trading with Pechs.