Why is a groom exempt from Shema on his wedding night?
The exemption is psychological: the groom's anxiety about the wedding night prevents the concentration needed for Shema. It's about mental capacity, not festivity.
Question 2
Why is someone watching over a dead body exempt from Shema?
The principle is "lo'eg larash" — mocking the poor/dead. Demonstrating mitzvah observance in front of someone who is permanently unable to perform them is disrespectful.
Question 3
Does a person who had a seminal emission need to immerse before reading Shema?
The Rambam states clearly: Ezra's immersion decree was abolished. Torah and Shema are accessible in any state of ritual purity.
Question 4
Can a woman in niddah read Shema and pray?
The Rambam rules that women in niddah may read Shema, pray, and study Torah. The abolition of Ezra's decree applies broadly.
Question 5
If two people are watching a dead body, how do they handle Shema?
They take turns: one guards the body while the other steps aside to read Shema, then they switch roles. This way both fulfill their obligation while maintaining respect for the dead.