013 "How to be מוסר נפש and Remain Alive"

We have heard about the Jewish professor in Virginia Tech, who sacrificed his life to save his students. Many spoke about his מסירות נפש. Is the only way to be מוסר נפש by sacrificing our life? We sometimes use the term "ער האט מסירות נפש" for seemingly minor matters. Let's clarify this statement, and examine whether we can perform a living מסירות נפש of our own.

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