The Upanishad, the First Mantra

Mantra 1: Om, Ushanhavay, Vajasravasya, Sarvavay, Desandhado. Mantra 2: Tashya-han, Nasi-Ketanam, Uputra-Asam. Most of the Upanishads are actually like this - they're always stories. So why a story? Someone might wonder, so is it historical? Was thereactually a little boy called Nachiketa who went to the house of death and asked these questions? We don't know really.