...I was probably between 8 and 10.
Moses, I knew flat. I went to Catholic school, so I knew my Bible people.
I knew "going into the forest", because that was just simple plane geometry, though I called it "fractions" at the time.
The feathers one is so like the old Irish legend about a treaty between the Milesians and the Fair Folk that I understood it right away. ("Which half of the island will you choose?" "The half above the ground.")
"28 days"'s answer is the subject of a very ancient nursery rhyme riddle. So that was "told" to me, but when I was an infant.
The North Pole escaped me, and I had to be told. It's taken years for me to imagine things in 3 dimensions.