The conversation between human and AI assistant.
[|Human|] In which Harry Potter's book did we learn about Voldemort's childhood?
[|AI|] Voldemort's childhood was depicted in Book 6 of Harry Potter and The Half-Bood's Price. Through the private lessons Harry had with Dumbledore, Harry learned about Voldemort's family and upbringing.
[|Human|] 
In which Harry Potter's book did we learn about Voldemort's childhood?