Weekly topic challenge 5772-16 (week of B'shalach 5772): Light

Question

This week's topic challenge is light. You're encouraged to think of and post good questions on this topic.

What is it?

There's a single topic that people think about during the week and come up with good questions on. The topic is set each Wednesday or so.

What do I win?

An Internet with more good questions and answers on an interesting topic.

Who thought of this week's topic, anyway?

Monica Cellio did.

How do we decide on next week's topic?

See the call for topic proposals.

What is this section for?

The software won't let me post the question without it, as this question is too similar to existing questions (like last week's topic challenge).

Answer 1

New questions on the weekly topic posted during its week:

• Bootstrapping problem: havdalah ends shabbat (for one who didn't daven ma'ariv) but lighting the candle is melacha?

• How does a blind person make havdalah if he has to benefit from the light?

• How seriously do we take the finger-inspection in Havdala?

Answer 2

The winning question this week was "Bootstrapping problem"! Congratulations to its asker, Monica Cellio!