If you Daven Maariv after Plag or after Shkiah can you count Sefirah? How to count of you're making early Shabbos? If a Rov forgot to count can he continue to count with a Brocha? And much more?
Was your Chametz really sold? Are your cookies really baked after Pesach? Can you have sourdough made after Pesach? How do the have pizza immediately ater Pesach? Can you but whiskey in duty free shops? And much more.....