Parshas Shemini

Why did Nodov and Avihu die?

1. 1.   Why did Nodov and Avihu die?
2. 2.   Bottom line: did Nodov and Avihu sin?
3. 3.   Why did Moshe Rabeinu say that Nodov and Avihu are greater than Moshe and Aharon?
4. 4.   What was the misconception?

Based on Likutei Sichos Vol. 12 pages 49-56 and others