If people leave davening early and there is no longer a minyan, what may be said b'tzibbur? Sources can be found here .

What prohibitions are pushed aside to put a patient's mind at ease on Shabbos and on Yom Kippur? Sources can be found here. 

If a camper finds someone else's canteen card and no one claims it, may the finder redeem the remaining balance? Sources can be found here. 

If one is travelling for many consecutive days, how many times does he say tefilas haderech? If one decides to travel further than expected, is it necessary to repeat tefilas haderech? Sources can be found here 

Is the ink/paint that rubs off the retzuos kadosh and require genizah? Sources can be found here .

Is it permitted to take time-release medication on Shabbos in advance of fasting on Tisha B'Av? Sources can be found here.