This guide just briefly explains the answers to each of the magpie's riddles, mainly because the second one is simple but has a specific form for the answer.
Answers
Question 1: In the house the floors need to be washed, the stove repaired and the soot cleaned off. What flies by itself and makes your nose itchy?
Answer: Dust
Question 2: A son has just been born, and the father is already rising up to the heavens. What are they?
Answer: Fire and Smoke
Question 3: Born in the water, it quickly fades in it. Humans put it on the table. What kind of substance is that?
Answer: Salt