Puzzle
I am about to throw a big party, and I bought 243 bottles of wine. 48 hours before the party begins, I receive a letter saying that one of those bottles has been poisoned. You have 5 rats, who are trained to drink wine and can only die of the poison (and not of excessive alcohol usage). When a rat is fed poisoned wine, it takes at most 24 hours for it to die. You cannot be sure whether it's drunk poison or not before the 24 hours have passed. How can you identify the poisoned bottle in 48 hours? (assume that the rat is allowed to taste a vine at an interval of 10 minutes)