A taxi hit a truck. A policeman spoke to the taxi driver and to the truck driver. He also spoke to Tom. He was a witness (目击者). This is what they said.

    TRUCK DRIVER: I was driving from the airport to Newton. A car crossed the road, so I slowed down. I did not stop. A taxi hit the back of my truck. Nobody was seriously hurt but both cars were damaged（受损害）.

    TAXI DRIVER: I was driving behind a truck a few kilometers from Newton. The truck stopped suddenly. The driver did not give me a warning (警告). I was driving very slowly. I could not pass the truck because there were two cars coming near from Newton. My taxi hit the truck, and some glass cut my left hand.

TOM: I was watching the traffic about a kilometer from the airport. A truck was going to Newton. It was not going very quickly. There was a taxi about two hundred meters behind the truck. It was going fast. When the truck slowed down, the taxi hit it. The taxi driver was not looking at the truck. He was looking out of the window at something. My friend saw the accident, too.

    Tom's friend spoke to the policeman and agreed with Tom.

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    Would it surprise you to learn that, like animals, trees can communicate with each other and pass on their wealth to the next generation--their young trees?

    Suzanne Simard, forest ecologist at the University of British Columbia, explains how trees are much more complex than most of us ever imagined. Simard and her colleagues have made the major discovery that trees and plants really do communicate and interact with each other.

    Trees live on through their group work and support, passing around the resources such as nitrogen and carbon “depending on who needs it by miles of underground fungi（真菌） networks. This makes sure that all trees in the forest ecological system give and receive just the right amount to keep them all healthy. This system works in a very similar way to the networks of neurons（神经元） in our brains, and when one tree is cut down, it affects all.

Simard talks about "Mother Trees". These are the largest, oldest trees that rise above the forest, a concept explained in the movie Avatar. These “Mother Trees" are connected to all the other trees in the forest by this network of fungi, and may manage the resources of the whole trees and plants in the forest. She explains how these trees pass on the wealth to the next generation, transporting important resources to young trees so they may continue to grow. When humans cut down "Mother Trees" without paying attention to these highly complex "tree societies” or the networks on which they feed, we are losing the chances to save the whole forest.

    "We didn't take any notice of it,” Simard says sadly. “Mother Trees move nutrition into the young trees before dying, but we never give them a chance.” If we could send this message to the forestry industry, we could make a huge difference towards our environmental protection efforts for the future.

    Imagine one day, the water taps (水龙头) in your house stop running. You have to buy water from shops. And still there isn't enough for everyone. Your mother has to save the family's shower water to do other things. Would you be able to stand that kind of life?

    Probably not. But that's what kids in Yemen are experiencing. Experts said Yemen is going to be the first country in the world to run out of water. According to a report, the capital, Sana, will run out of drinking water as early as 2025.

    Because of the shortage, the government often cuts the water supply(供应). Hannan, an 18-year-old from Lahej, told Times, "In a good week we'll have a water supply all week. But then the following week there will be water only for a day or two."

    Hannan said only rich people have enough water to use. They can buy water from the shops or from the water trucks. Private companies own the trucks. They travel around the city every day to sell water—at very high prices. "A lot of people can't afford it," she said.

    The average(平均) person in Yemen uses 100 to 200 cubic(立方) meters of water per year. That is far below the international water poverty(贫困) line of 1,000 cubic meters.

    The government is thinking of making use of seawater. But it will cost a lot and it may not happen soon enough to help the people of Yemen.