well I had to write up a big reply on how tulpae are capable of either not knowing things you know or having brain farts Fun stuff I've had mine be in the dark and ask me about things I knew but it was usually followed by a quick confirmation after I point out I know whta it is. It's ignorance that does it or just a brain fart like when I have a conversation, you tell me I said something and I'm like "What? I didn't- oh yeah I did nvm lel" it's similar to that I think less not knowing and more a brain fart in most cases. However, there are cases where  hosts lock away certain memories or the tulpa prefers to learn something themselves so they don't read about it/access the memory those cases or ones where the tulpa simply can't be bothered to look something up they find trivial at the time would attribute to such a scenario   The posts: http://i.imgur.com/0VrG1m6.png http://i.imgur.com/hHFrP6B.png