Are we getting more stupid? According to Gerald Crabtree, a scientist at Stanford University in the US, we are.  You may not want to hear this, but Crabtree believes that human intelligence reached its peak more than 2,000 years ago and ever since then has been going downhill. “If an average Greek from 1,000 BC were transported to modern times, he or she would be one of the brightest among us,” Crabtree told The Guardian.

    At the heart of Crabtree's thinking is a simple idea. In the past, intelligence was critical for survival when our ancestors had to avoid dangerous animals and hunt for food. The difference of being smart or stupid is often life or death. However, after the spread of agriculture, when our ancestors began to live in dense ( 稠密的）farming communities, the need to keep their intelligence in peak condition gradually reduced. This is not hard to understand. Most of the time,pressure is what keeps us going – you need the pressure from your teachers to finish your homework; the pressure of looking pretty prompts(促使) you to lose weight when summer comes. And the same is also true of our intelligence – if we think less, we become less smart.

    These mutations(变) are harmful to our intelligence and they were all developed in the past 3,000 years. The other evidence that Crabtree holds is in our genes. He found that among the 2,000 to 5,000 genes that we have that determine human intelligence , there are two or more mutations in each of us. However, Crabtree's theory has been criticized by some who say that early humans may have better hunting and surviving abilities, but people today have developed a more diverse intelligence. For example, spearing a tiger doesn't necessarily require more brainpower than playing chess or writing a poem. Moreover, the power of modern education means a lot more people have the opportunity to learn nowadays. “You wouldn't get Stephen Hawking 2,000 years ago. He just wouldn't exist,” Thomas Hills of the University of Warwick, UK, told Live Science. “But now we have people of his intellectual capacity doing things and making insights(洞察力) that we would never have achieved in our environment of evolutionary adaptation.”

    After years of research and testing, the hybrid car was developed and put on the market. It' s an interesting and exciting new improvement in today' s world as we look for better ways to protect the quality of the air we breathe and conserve our natural resources.

    The quality of our air is affected by many different things. But one of the largest sources of air pollution is the burning of fossil fuels such as coal and gasoline which is used to power a car' s engine. The EPA has set national standards to help control the level of harmful pollutants sent off into the air, and the automobile industry has acted by producing a hybrid car that uses less gas and therefore causes less pollution.

    A hybrid car is a combination of a regular car that runs on gasoline and an electric car that is battery powered. Some people tend to think that since the hybrid car is partially electric, you have to plug it in to charge it. But that's not how it works. The 144-volt battery pack is actually recharged through the energy that is produced when the car's brakes are used. This is referred to as “regenerative braking”, because it generates electricity.

    Although the hybrid car still runs on gasoline most of the time, this helps it use less gas than a regular car. When the driver stops at a traffic light, the engine automatically shuts off to save fuel. Then, as soon as the driver puts the car in gear and touches the gas pedal, the engine starts back up.

    Have you ever ridden in a car with someone who ran out of gas? That probably wouldn't happen if you were riding in a hybrid car. It flashes a warning on its computer screen that says, “I am low on gas”. When it completely runs out, the warning reads, “YOU ARE NOW OUT OF GAS!” Then the electric power supply kicks in to let the driver travel a few more miles to a gas station.

    Home from the Navy, I started school at Greenville College in my hometown of Illinois. I'd been out of high school for four years, but my high school headmaster, Mr. Gardner, invited me to a Valentine's Day dance party at school. The thought of seeing my former teachers was exciting. So I agreed.

    When Friday came, I cleaned up, dressed up and drove to the high school gym. I chatted with my teachers and approached Mr. Gardner to thank him before leaving. Just then, the band started playing and a young girl stood up to sing. One look at and I was crazy—I had never seen such a beautiful girl!

    I asked Mr. Gardner who she was, and he answered, “That's Marilyn Riley, Cut Riley's daughter.” I was shocked to say the least. They lived just around the corner from me. I walked across the gym floor to introduce myself, “Hi, I'm Jack Joseph.”

    “I know who you are,” was her not-too-friendly response.

    “Would you like to dance?” I asked. “No! I'm working,” she shot back.

    “Can I call you next week for a movie date?” I asked. “No,” was her response.

    For the next month I phoned, trying to set up a date. She always had the same answer: No. then one rainy afternoon in March as I was driving home after basketball practice, I saw Marilyn, walking with no umbrella, no raincoat, no hat. I pulled alongside her and asked if she needed a ride, half expecting her to say no. instead, she stepped over the roadside and sat down on the seat next to me. It was only a few blocks to her house, but after pulling into her driveway we talked for 45minutes. It was magic from then on.

    I live in the center of the city and there is a largeparking lot full of parking spots nearby. Rain is a rare occurrence in LA,so cars easilycollect pollutants and dust. Together with my friends,I decided it shouldbe a kind gesture to surprise the owners with a car wash.So we bought carwashing supplies and brought out all the bath towels we could find.With all the suppliesin hand, wewere able to convince another roommate to help out as well and we beganwatering down the cars.

    Every once in a while, someone would come by and asked usseemingly stupid men, "Who told you to wash the cars?" or, even better, "who paid you to wash their cars?" Weexplained we just wanted to do something kind. But our response was often me with aneven more confused look.

    As the afternoon went on, some other friends that came byunderstood our goal of the spontaneous event and started helping out with someof the duties. Firstone friend then two, and by the time we had cleaned the entire lot,we had an entire carwashing crew with independent individually assigned tasks and duties.

    I wasn't cleaning cars to be able to afford a new phone.I was cleaning carssimply because I wanted to offer the car owners kindness.There was noequipment to weigh our value created. We couldn't measure our success indollars earned over the time spent washing cars when we could have been earningtwice as much at work.

    I now realize, first hand, that there is a special energy createdwhen you choose to think bigger than yourself and act in service of others andmaybe, likeme, you'llfind it's actually the greatest gift you' you'll ever get.

Amazing Stories of Animals Acting Just Like Humans

    ◆Horses are picky eaters

    Horses have an even better sense of smell than humans do. When horses raise their noses and open their nostrils (鼻孔), their nervous system allows them to sense smells we can't sense. This might explain why they refuse dirty water and carefully move around meadows, eating only the tastiest grasses, experts say.

    ◆Whale says thanks

    In 2011, a whale expert spotted a humpback whale trapped in a fishing net and spent an hour freeing it. Afterward, in an hour-long display of thanks, the whale swam near their boat and leaped into the air about 40 times.

    ◆Pandas like to be naughty

    Is there anything more lovely than a baby panda, except maybe a human baby? In fact, baby pandas sometimes behave like human babies. They sleep in the same positions and value their thumbs. Pandas are shy by nature for its shy behaviors such as covering its face with a paw of ducking its head when confronted by a stranger.

    ◆A cat honors its owner

    Paper towels, and a plastic cup are just a few of the gifts that Toldo, a devoted three-year-old gray-and-white cat, has placed on his former owner Iozzelli Renzo's grave every day since the man died in September 2011. Renzo adopted Toldo from a shelter when the cat was three months old, and the two formed an inseparable bond. After Renzo passed away, Toldo followed the coffin to the cemetery, and now "stands guard" at the grave for hours at a time.