"Beginning is relative. Beginning of world, beginning of alphabet, beginning of Dewey decimals, beginning of biology from egg to baby." River thought for a moment, her fingers absently working, tips touching together as she tried to think of what would be most relevant for him to learn.
"Start of society," she decided. "Modern for Earth That Is," she declared as she moved through the shelves, fingertips skimming over the spines of books before she plucked one free from the shelf. "Volume one," she said as she handed it to him.
They would likely be here all day, absorbing knowledge and answering each other's questions, and that suited River just fine.