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“A tennis ball has rolled its way down into a hole. This particular hole is extremely deep and has a sharp bend in the middle, making the ball impossible to retrieve by hand. To make matters worse, the ground around the hole is made of hard clay, so digging the ball out isn't an option. However, you have something incredibly commonplace on hand that you can use to get the ball out. What do you use to get the ball out? Answer in five letters.”
“‘You can't reach the bottom of the hole, so how about trying to find some tool that can,’ you say? No, no, that's not the way. Is there some way you can get the ball to come to the mouth of the hole?”
“Think about the particular characteristics of a tennis ball. It bounces, it's light... Well, it has many interesting properties, but what happens when you throw a tennis ball into a lake?”
“If a great rainstorm were to come along right now, you could probably retrieve your ball without doing anything at all. Think about why that is. And just what is “rain,” anyway?”
If you can't reach in and grab the ball, you're going to have to get the ball to come to you.
“That's correct! Theoretically, you could any liquid in which tennis balls can float, but water is the liquid you would most likely have handy. Since the ground is hard to clay, there's little chance of the water getting absorbed into the surrounding earth. Tha ball should come up with little difficulty.”
Die Lösung ist: WATER (jap. みず).
- Das Rätsel kommt im ersten Band von Professor Layton und seine lustigen Fälle vor.