Winter is the perfect time to see Washington in a different light. The crowds have thinned, and those humid 95-degree days are long gone. And the National Zoo is a different experience because of 500,000 bulbs that illuminate the annual Zoo-lights celebration.

    Eco-friendly twinkly lights will decorate zoo walkways, trees and buildings. Sculptures featuring popular zoo residents, including elephants and giant pandas, light up in time to music.

    If walking and watching isn't enough excitement, head to Lion & Tiger Hill, home to a 150-foot-long snow-less tubing run. Rides on the trackless train and the carousel also will be available.

    Don't forget to visit a few of the zoo's real animals. The Kids' Farm, Reptile Discovery Center, Small Mammal House, Think Tank (orangutans) and Great Cats exhibit will be open in the evening. There's no guarantee, however, that the animals will be as lively as the humans in attendance.

    When: Friday to January 1 (except December 24-25), 5 to 9 p.m.

    Where: 3001 Connecticut Ave. NW, Washington, D.C.

    How much: Admission is free; limited parking is $22. Charges for tubing, train rides and carousel rides.

    For more information: A parent can visit nationalzoo.si.edu/events/zoolights.

    More ZooLights celebrations: For those outside of the D.C. area, here are some links to other zoos with similar events (not all are free):

    Columbus Zoo, Ohio: Through January 1.

    Detroit Zoo, Michigan: Through December 31.

    Denver Zoo, Colorado: December 2-January 1.

    Houston Zoo, Texas: Through January 15.

The True Story of a Young Man

When Reginald Lindsay received a scholarship to Morehouse College in Atlanta, Georgia in 1967, what he wanted most was not a job with a good salary, but a chance to be a member of Congress as a southern representative. After earning his degree at Harvard Law School in 1970, he returned to the South to practice law among the poor. "I want to help them understand what their rights are and to help them achieve them," he said. Then he ran for political office at the local and state level until he was ready to try for Congress.

Reg grew up in a low-income Negro section of Birmingham, Alabama. Brought up by his grandparents after his parents were divorced while he was very young, Reg had been living through a period of far-reaching progress in race relations. In the summer of 1968 Reg himself became a good example of this progress when he became the first Negro student appointed to a special new program. The program introduced bright young students to the workings of the Georgia State government and encouraged them to seek employment there after finishing their education. "I've been lucky," he said. "I seem to have been in the right place at the right time."

But luck was only part of Reg's story, for he made the most of opportunities that came his way. He learned to read in kindergarten and began visiting the public library regularly to borrow books. His grandparents encouraged him, though neither of them had much education, and they bought him a set of encyclopedias. "I loved those books," he remembered. "I used to come downstairs before breakfast and read short articles. I enjoyed reading about famous men, and then I would pretend to be one of them. I guess it was partly a childish game and partly an escape. It wasn't too much fun to be a Negro when I was a kid." While studying for his bachelor's degree at Morehouse College, Reg worked on several political campaigns helping candidates get elected to government offices. At the same time he maintained a "B" average while majoring in political science.

With just two more years to complete at Harvard Law School, which also gave him a scholarship, Reg made a good start on his professional career. He said, "The good life for me is the kind of life where I can find satisfaction in public service." Then in 1975 he was the Massachusetts state commissioner of public utilities and from 1993 to 2009 he was judge of the United States District Court for the District of Massachusetts.

    It was a cold winter. The wind blew all night and the snow was blinding. When morning came, my three children and I got up and made our way to the windows. As we looked out of the window, we saw that the henhouse was gone. Our three hens had been blown away by the cold wind.

    I looked at the emptiness outside. Then I saw all three chickens sitting around the edge of a white bucket. I couldn't believe my eyes! How was this violent wind not blowing them into the field beyond？I quickly pulled on long snow pants and heavy winter coat, wrapped a scarf around my neck and stuck my feet into large boots.

    I shouted at the wind as it blew. I was alone, struggling in the snow. They stared out the window into the vast white sea of snow, peering at any sign of movement. Outside I heard the sound of my boots as I walked against the wind.

    As the snow circled around me, I steadily made my way to the soft cluck-cluck-cluck sound my hens always made. When I reached them, I saw that their little feet were holding on to the edge of the bucket, heads bent forward and away from the wind. I gently lifted each hen and put it carefully into the warm inside. Then I began the freezing walk back to the small shed directly behind our house. One by one I laid my chickens on the cold floor, and they began to cluck softly.

    As I shut the shed doors, my eyes went directly to the window where my children were watching. They jumped up and down cheering, and so did I! I wasn't some dragon slayer(屠龙者) from a fairy tale. I was simply a mom, but the look on my children's faces told me that they thought I was a hero mom.

    Some of the best research on daily experience is rooted in rates of positive and negative interactions, which has proved that being blindly positive or negative can cause others to be frustrated or annoyed or to simply tune out.

    Over the last two decades, scientists have made remarkable predictions simply by watching people interact with one another and then scoring the conversations based on the rate of positive and negative interactions. Researchers have used the findings to predict everything from the likelihood that a couple will divorce to the chances of a work team with high customer satisfaction and productivity levels.

More recent research helps explain why these brief exchanges matter so much. When you experience negative emotions as a result of criticism or rejection, for example, your body produces higher levels of the stress hormone, which shuts down much of your thinking and activates(激活) conflict and defense mechanisms(机制). You assume that situations are worse than they actually are.

    When you experience a positive interaction, it activates a very different response. Positive exchanges increase your body's production of oxytocin, a feel-good that increases your ability to communicate with, cooperate with and trust others. But the effects of a positive occurrence are less dramatic and lasting than they are for a negative one.

    We need at least three to five positive interactions to outweigh every one negative exchange. Bad moments simply outweigh good ones. Whether you're having a conversation, keep this simple short cut in mind: At least 80 percent of your conversations should be focused on what's going right.

    Workplaces, for example, often see this. During performance reviews, managers routinely spend 80 percent of their time on weaknesses and "areas for improvement". They spend roughly 20 percent of the time on strengths and positive aspects. Any time you have discussions with a person or group, spend the vast majority of the time talking about what is working, and use the remaining time to address weaknesses.

    At 1,345 meters above sea level, Ben Nevis is not the world's most difficult mountain to climb. But things get considerably tricky if instead of hiking shoes you put on a pair of 5-inch high heels, especially if you're a guy. One English teenager recently proved that it was not impossible.

    Ben Conway, a 19-year-old art student from London, recently took up the challenge as a way to stand out in an application for a scholarship for the School of Communication Arts in Brixton. He started his unusual high-heel climb at 8 a.m., on June 27, and was joined by Callum MacKenzie Allen, a friend from his art foundation year, who videotaped the whole thing for a two-minute video that was used as his application project. The whole climb took five hours and wasn't the smoothest experience.

    Halfway up Ben Nevis, one of his shoes broke, so he had to tape the shoes to his feet to make sure they stayed on. The weather didn't make it easy for him either, as he claimed that it rained pretty much the whole time, and he had to go against 40 to 50 miles an hour winds. Due to these difficult conditions, Ben and his friend had to turn back after reaching 900 meters up the mountain.

    Besides providing a unique art school application project, the high-heel climb also allowed the 19-year-old to raise some money for worthy causes (事业), like Sal's Shoes, which provides footwear for barefoot children around the world.

    "Raising money for charity brings happiness to people's lives and if I can do something ridiculous and bring someone happiness, then that's what it's all about." Ben said.

    A scientist once said: "I have concluded that the earth is being visited by intelligently controlled vehicles from outer space."

    If we take this as a reasonable explanation for UFOs (unidentified flying objects), questions immediately come up.

    "Why don't they get in touch with us, then? Why don't they land right on the White House lawn and declare themselves?" people asked.

In reply, scientists say that, while this may be what we want, it may not necessarily be what they want.

    "The most likely explanation, it seems to me," said Dr. Mead, "is that they are simply watching what we are up to—that responsible society outside our solar system is keeping an eye on us to see that we don't cause a chain reaction that might have unexpected effects for the outside of our solar system."

    Opinions from other scientists might go like this: "Why should they want to get in touch with us? We may feel we're more important than we really are! They may want to observe us only and not interfere(干涉) with the development of our civilization. They may not care if we see them but they also may not care to say 'hello'."

    Some scientists have also suggested that Earth is a kind of zoo or wildlife reserve. Just as we set aside wilderness areas and wildlife reserves to allow animals and growing things to develop naturally while we observe them. So perhaps Earth was set aside ages ago for the same purpose.

    Are we being observed by intelligent beings from other civilizations in the universe? Are they watching our progress in space travel? Do we live in a huge "zoo" observed by our "keepers," but having no communication with them?

    Never before in our history have we had to face ideas bravely like these. The simple fact is that we, who have always regarded ourselves as supreme in the universe, may not be so. Now we have to recognize that, among the stars in the heavens, there may very well be worlds lived by beings who are to us as we are to ants.