Rarely does such a short problem open up such a big idea. Here it is not whoever tries the most who wins, but rather whoever makes the most of what each rat can say.
The thousand poisoned bottles
Riddle statement
You have 1000 bottles of wine. One of them is poisoned, and a single drop is enough to kill a rat exactly 24 hours later.
You have 10 laboratory rats and you can only do one round of tests. You can prepare a mixture for each rat with drops from several bottles.
How do you identify with certainty the poisoned bottle in a single 24-hour cycle?