I will never forget the days when I met with my classmates. Early in the morning of our first school day, our professor introduced himself and challenged us to get to know someone we didn't know yet. I stood up look around when a gentle hand touched my shoulder. I turned round to find a wrinkled, little old lady beaming up at me with a smile that lit up her entire being.

    She said, “Hi handsome. My name is Rose. Can I give you a hug?”

    I laughed and enthusiastically responded, “Of course you may!” and she gave me a giant squeeze.

    “Why are you in college at such a young, innocent age?” I asked.

    She jokingly replied, “I'm here to meet a rich husband, get married, and have a couple of kids…”

    “No seriously,” I asked. I was curious what may have motivated her to be taking on this challenge at her age.

    “I always dreamed of having a college education and now I'm getting one!” she told me.

    After class we shared a chocolate milkshake. We became instant friends. Every day we would leave class together and talk nonstop. I was always mesmerized（迷住）listening to this “time machine” as she shared her wisdom and experience with me.

    At the end of the semester we invited Rose to speak at our football banquet. I'll never forget what she taught us.

    “There is only one secret to staying young. You've got to have a dream. When you lose your dreams, you die. We have so many people walking round who are dead and don't even know it! There is a huge difference between growing older and growing up. If I am eighty-seven years old and stay in bed for a year and never do anything I will turn eighty-eight. Anybody can grow older. That doesn't take any talent of ability. The idea is to grow up by always finding opportunity in change. Have no regrets. The elderly usually don't have regrets for what we did, but rather for things we did not do. The only people who fear death are those with regrets.”

    She concluded her speech by courageously singing The Rose. She challenged each of us to study the lyrics and live them out in our daily lives.

    It's a white Christmas in the United States today, with snow falling from Seattle to Maine.

    Northeast

    Biting winds with snow swept the Northeast.

    Earlier, up to 15 inches of snow fell during a snow storm in Maine, while up to one foot fell in New Hampshire. Winds reached 76 mph on Cape Cod, Massachusetts, while up to 61 mph winds tore through Long Island, New York. Falling snow collected on the runways at Boston's Logan International Airport, causing temporary flight delays.

    The wind was so severe in Pennsylvania and New Jersey that the annual (重演) of George Washington and his soldiers'crossing the Delaware River was canceled, the Washington Crossing Historic Park told ABC News.

    Midwest

    Heavy lake effect snow fell in western Michigan.

    The National Weather Service has issued a wind-chill warning and advisory (公告) from Montana to Michigan. Bitter cold air in the Midwest produced wind chills Monday morning as low as minus 48 degrees in North Dakota and minus 47 in northern Minnesota.

    As this bitter cold made its way east overnight, it was expected to move over relatively mild Great Lakes, producing intense lake-effect snow bands capabie of producing 2 to 4 inches of snow in an hour.

    West Coast

    That storm system moved overnight through the Rockies, bringing more snow and the threat of avalanches(雪崩). The National Weather Service has issued an avalanche warning for the Wasatch Range Mountains outside Salt Lake City.

    Webber is a labor economist. His latest research offers guidance on how to keep students on target to earn a degree from a college or university. Among his findings: It is important, whenever possible, for college students to complete their degree program in four years. Also, getting a part-time job is probably a good thing to help finance a college education. But too much time spent working on a job makes it less likely the student will graduate.

    One thing, Webber said, is financial aid that helps many students pay for college. Scholarships and other assistance generally stop after four years. So the cost of each additional year in school is likely to come almost entirely from the student and/or parents.

    But there are other reasons why taking more than four years is a problem, as Webber notes. It's because life gets in the way, other things happen. He means the longer you stay in college, the more likely that some unexpected event will affect your studies. It could be a loved one getting sick, a parent losing a job, or the student running out of money for college.

    Only about four in 10 graduated within four years. It is also important that students have enough time to complete their college classes, Webber added. His research suggests part-time work of 15 hours or less will not cause harm to the student's scholastic performance. But his research shows students who work 20 hours or more a week are about 15 percent less likely to graduate on time, or to graduate at all.

    His belief is that students active in college athletic programs would face the same problem. It is common, he said, for student athletes to spend 20 hours or more for training, travel and to compete against athletes or teams from other schools.

    My first term at MIT（麻省理工学院）was awesome—I got all A's, and I declared math as my major. My parents were expecting me to become a doctor like them so I was trying to satisfy them. But I was desperately running away from them. I had no idea what I wanted to do with my life. My third term, I ended up with a D in math. I didn't do that well in my other classes, either. It seemed like all my friends were doing so well, getting opportunities over the summers.

    My fifth term, I realized that I was awful at higher-level math. I had lost all confidence in myself. I went to a few classes at the beginning of the term, but after by midterm, I had totally stopped. My only relief was the dance team I was on. I would sleep all day, and then go to dance practice, and then go back to sleep. As expected, I failed in all of my classes and had to withdraw from MIT.

    I had no choice but to tell my parents. Instead of yelling or hitting me, though, they just held me and cried. The next day, my dad took a day off from work and took me to a nearby, small arts college.

    I had lost all confidence in myself. Before my first biology test, I didn't think I could pass. I did pass. Since I had so much free time, I decided to join a biology lab. I realized that was what I wanted to do! I wanted to be a scientist!

    This past May, I graduated with the highest honors, and now I have my PhD in biology. Though it ended up taking me 5 years to graduate from college, I can say now that dropping out of MIT was one of the best things that ever happened to me. I've realized that a person is not their grades. I've realized how much my parents loved me. I've finally discovered my passion（热情）in life!

    Scientists recently discovered three tyrannosaur (霸王龙) trackways in Canada. The trackways suggest the meat eaters traveled and hunted in groups. The 70-million-year- old footprints are the first tyrannosaur trackways ever found.

    Tyrannosaurs were a type of meat-eating dinosaur that included the strong Tyrannosaurus rex and Albertosaurus. “Groups of tyrannosaurs may have stuck together as a group to increase their chances of bringing down animals and individually surviving,” study coauthor Richard McCrea says. He works for Canada's Peace Region Paleontology Research Centre. It's believed that tyrannosaurs were solitary creatures. The newly discovered trackways could change the way scientists look at these frightening beasts.

    Trackways can uncover a lot about the social behavior of a species. Unfortunately, very few tyrannosaur footprints have ever been found, and until recently, the only ones known were single prints discovered in Mongolia, the western U.S., and western Canada. But in October 2011, a hunting guide named Aaron Fredlund found two tyrannosaur track marks near Tumbler Ridge, an area in the foothills of the Canadian Rockies. Over the next year, McCrea and his team searched the site and found the remaining trackways.

    The footprints are at about the same depth, which suggests the tyrannosaurs moved through the area at the same time. Impressions of the dinosaurs' rough skin are even visible in the prints. The prints are also in near-perfect condition. That's because the ground had a high clay (黏土 ) content when the dinosaurs walked through the area. The land was later covered by a thick layer of volcanic ash, which kept the marks intact (完整). "This is the most ideal situation you could ask for," McCrea says.

    Researchers aren't sure of the exact species of tyrannosaur that left the prints. But the historic findings show a great deal about how the beasts moved and behaved. “We have extremely convincing evidence that tyrannosaurs traveled in groups,” says McCrea. "This is probably the most important evidence to come out to date on that topic."

    Elizabeth and I are 18 now, and about to graduate. I think about our elementary school friendship, but some memories have blurred(模糊). What happened that day in the fifth grade when Beth suddenly stopped speaking to me? Does she know that I've been thinking about her for seven years? If only we could go back, and discover what ended our relationship.

    I have to speak with Beth. I see her sometimes, and find out school is "fine". It's not the same. It never will be. Someone says that she's Liz now, what happened to Beth?

    I can't call her. Should I write? What if she doesn't answer me? How will I know what she's thinking?

    Yes, I'll write her a letter. These things are easier to express in writing. "Dear Be-," no, "Dear Li-" no, "Dear Elizabeth," I begin. The words flow freely, as seven-year-old memories are reborn. I ask her all the questions that have been left unanswered in my mind, and pray she will answer. I seal my thoughts in the perfect white envelope, and imagine Beth looking into the mailbox. Will she know why I'm writing? Maybe she once thought of writing the same letter.

    As the mailman takes my envelope from me forever, I wonder if I've made the right decision. Do I have the right to force myself into Beth's life again? Am I simply part of the past? I have taken the first stop. Beth has control of the situation now.

    One day has passed. Are my words lying on the bottom of the post office floor.

    Two days are gone. I'm lost in thought and don't even hear the phone ring.

    "Hello? It's Elizabeth"