“It's just a story,”you may think. But new research has found that crows' brains may sometimes be better than those of 6-year-old children.

In a recent experiment, American scientist Corina Logan and her team caught six crows to test them. The crows and children had to choose between two sets of tubes(试管). They had to drop stones in and get water.

With the red set, when they dropped a stone into a wide tube, the water level raised in a connected narrow tube. The blue set of tubes, however, had no connection between them.

Children aged 7 to 10 were able to learn the rule. Children aged 4-6, however, failed.Five of the six crows failed the test. But Kitty, a 6-month-old crow, passed it. She put most of the stones into the red tubes.

So, could a bird be more clever than a kindergartner? Don't be too quick to say no.

    When was the last time you saw three men running down a forest trail（小径）in the rain wearing flip-flops（拖鞋）？That's what my friend Brandon, Josh and I were doing last autumn. We were looking for a waterfall（瀑布）.We didn't have much time to get to the waterfall and back, so we were running. We were wearing flip-flops to prevent our shoes getting dirty.

    It was raining, but lightly. It kept us cool as we climbed over giant stones and through a shallow（浅的）stream. We followed red arrows（箭头）and crossed that stream several times, walking on toward the promised waterfall. Time was not on our side, however, and we were forced to turn around. As we started back, we looked at the shallow stream we had just crossed. Where did this rushing river come from? That was when we realized a flash flood was around!

    In the few minutes the water rose at a fast speed. Now there were no big stones to be seen-only what looked like lumps（隆起）covered with rushing water. We had no choice but to move our way back carefully in the rushing water -in flip-flops. We had crossed the stream not once or twice, but six times in search of a waterfall that we never even reached!

    With most of the crossings, we needed each other's help if we didn't want to be washed away by water. Wet all over, we felt relaxed after we made the last crossing.

    "My dad always told me to keep off a river when travelling in the rain." Josh said as we hurried back down the path.

    "Why didn't you tell us that earlier?" I laughed.

    "Would it have made a difference?" came the reply.

    He had a point.

    Larry is going to be a pilot. He wants to fly an airplane. But Larry is not a rich man. He doesn't have an airplane. He has only a chair. Larry ties 45 big balloons to his chair and then sits in the chair. The chair goes up.

    For a few minutes, everything is fine. The view from the chair is beautiful. Larry can see houses and trees below him. He is happy. He is flying!

    The chair goes up very high. Larry is afraid. “I don't want to go very high,” Larry thinks. “I want to go down a little.” With a small gun, Larry shoots 10 balloons. Then something terrible happens. Larry drops the gun, and it falls to the ground. Larry can't shoot more balloons. The chair goes up and up.

    Larry is three miles above the ground. Airplanes are flying over him. Larry has a small radio. “Help! Help!” he says into the radio. “I'm flying in a chair, and I want to come down!” People hear Larry, but they can't help him.

    Larry flies in the chair for 45 minutes. Then the balloons begin to lose air, slowly the chair comes down, and Larry is back on the ground. He is not hurt.

    Once upon a time in a land far away, there was a wonderful old man who loved all kinds of small animals, such as spiders, insects and butterflies and so on.

    One day while walking through the woods, the nice old man found a cocoon（茧） of a butterfly. He took it home.

    A few days later, a small opening appeared. He sat and watched the butterfly for several hours as it struggled to make its body out of that little hole. Then it seemed to stop making any progress. It appeared it could go no farther.

    Then the man decided to help the butterfly, so he took a pair of scissors and snipped off the remaining bit of the cocoon. The butterfly then got out of the cocoon easily.

    But it had a swollen（肿胀的） body and small shriveled（枯萎的） wings. The man continued to watch the butterfly because he expected that, at any moment, the wings would enlarge to be able to support the body, which would contract（收缩） in time. Neither happened! In fact, the butterfly spent the rest of its life crawling around with a swollen body and shriveled wings.

    What the warm-hearted man in his kindness did not understand was that the restricting cocoon and the struggle required for the butterfly to get through the tiny opening were Nature's way of forcing fluid（体液） from the body of the butterfly into its wings, so that it would be ready for flight once it achieved its freedom from the cocoon.

    Sometimes struggles are exactly what we need in our life. If we were allowed to go through our life without any difficulties, it would be bad for us. We would not be as strong as what we could have been. And we could never fly.