Shabbat 22

This week's shiurim are sponsored in memory of Zalman Leib ben Moshe and by Talia Kaplan in honor of her sister, Talia Kaplan for doing daf yomi - she's very proud of you and keep up the good work - and by Adam and Sharron Cohen for a refuah shleima for Daphna Chaya bat Sara. 

What is the maximum height one can put Chanuka candles? Can one count money using the light of Chanuka candles? Is this different from what Rav said regarding Chanuka candles - that one cannot use the light from them? Rav and Shmuel disagree regarding can one light from one Chanuka candle to another. Two reasons are given for Rav's opinion and in exactly which situations they disagree. Is it the lighting that is the mitzva or placing the candles down?