As a child, we all learned a fable, "Crow Water", the story is: "A thirsty crow saw a narrow mouth bottle with half a bottle of water, so the small stone into the bottle, so that the water rise, thus drinking water." "In fact, the crow's cleverness is more than this ...
In the experiment, the Crow knew that putting the stone into the water would make the water rise and throw the stone into the sand without this change. Crows know that heavy stones can make the water rise higher, than light stone or small stone effect better. The Crow also knew that the effect of casting a stone into a glass jar was not so good as to cast a stone into a glass jar, even the U-shaped glasses could be done. It was so clever and terrible.
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