What do Tom Sawyer and jumping frogs have in common? Stories about both of them were created by one man：Mark Twain. Born Samuel Langhorne Clemens, Mark Twain was his pen name. When Twain was 4, his family moved to Hannibal, Missouri, lying on the west bank of the Mississippi. Twain grew up there and was attracted greatly with life along the river - the steamboats, the big wooden boats, and the people who worked on them.

    The Celebrated Jumping Frog of Calaveras Country is one of Twain's best-loved short stories, and The Adventures of Tom Sawyer is one of his most famous novels. Both these works are celebrated by events held during National Tom Sawyer Days. There's also a fence-painting competition to see who can paint the fastest. The idea for this competition comes from a scene in Tom Sawyer, in which Tom has been told to paint the fence in front of the house he lives in. It's a beautiful day, and he would rather be doing anything else. As his friends walk by, he persuades them to paint with him for fun, and they all join in the "fun". By the end of the day, the fence has three coats of paint!

    Although the story of Tom Sawyer is not true, it's based on fact. If you go to Hannibal,, you'll see the white fence, which still stands at Twain's boyhood home.

    I grew up in a troubled home in the 1970s, on the outskirts of downtown Orlando, Florida. Not far away, a three-story house attracted my eyes.

    It was nothing like the one I lived in with my mother, a small dark place with rules about befriending others. “Don't. Never, ever talk to anyone,” my mother said.

    One day, in sixth grade, a black-haired woman was introduced to our class: Mrs. Reese. Reese explained that she was starting Spanish Club. She invited anyone interested in learning Spanish language and culture to stay after school.

    I could not take my eyes off her bracelets(手镯) and shining rings. The bell rang, and to my shock, no one went up to Mrs. Reese. I was under strict orders to go straight home. But that day, I stayed. I asked Mrs. Reese when the club started.

    “We could begin right now if you like,” she said with a smile. I felt beautiful. That day I learned that the house of my dreams was her house. I learned how to answer questions about my age and my favorite food in Spanish. And I learned, “Do you want to come over tomorrow for cooking lessons?”

    I wanted to say “Yes”, but Mom's words held me back.

I begged my mother all summer and into fall, well after Spanish Club had dissolved. I wept at night sometimes, so worried that Mrs. Reese and her family would move away.

    At some point, I managed to wear my mother down and one Saturday afternoon. I rode out to Mrs. Reese's house.

    The details of that afternoon are marked in my mind: We had tea. She painted my toenails red. We made a garlicky picadillo. We spoke in Spanish. In Spanish, my voice was loud and romantic. This is the real me! I remember thinking.

    My mother never permitted me another visit to Mrs. Reese's house. But four decades later, I still remember that day and the life she showed me, proof of a possible future.

    Having a job is great, I have learned. It means I can afford things such as a place to live and daily meals. And with an above-average job, I can afford a car and occasional overseas vacations.

    However, I also understand how difficult it is to have a below-average job, having had many of them before. It's frankly pretty awful. Owning a car was out of the question – I could barely afford to ride the subway.

    So, I decided to go to university and get a degree.

    Later, I emailed my details to every company and government institution with an online careers page. I even printed my resume and handed it out in what seemed like hundreds of office buildings.

    One summer during university, my cousin and I helped out at my uncle's business, fixing roofs, although the only thing I got out of that was back problems.

    That same year, I got a job at a plumbing(管道工程) company, which I was terrible at. It was no surprise when I was asked to leave that job after only four days.

    A lot of people today believe the problem of unemployment in my generation is our fault. Some accuse us of being lazy or feeling too entitled(有资格的). At the same time, some people accuse members of my generation of having a sense of “specialness” that has led us to believe we can all be astronauts, movie stars or singers if we put our minds to it. Also, a few of them think that we would all be happily employed if we would only learn trades or become software engineers, because those people make the most money.

    I realize that not everyone can go into space, star in Hollywood movies or fill stadiums with fans, however. I also think not everyone can make a good electrician or design advanced computer software – I know I can't. Everyone is good at something, but no one is good at everything. It took me hundreds of rejection emails to realize that I had to focus on finding a job where I could actually be successful.

    And now, I finally have that job. All it took was several years of desperation, failure and an honest assessment(评估) of my personal value in the job market.

    It's not the best start, but it's not bad for a start too.

    The month of March was a milestone for supporters of renewable energy in the U.S. For the first time, wind and solar power accounted for more than 10% of the country's electricity—up from less than 1% at the turn of the century. And total wind and solar power-plant capacity(发电量) is expected to grow more than 30% over the course of this year and next, according to the Energy Information Administration.

    Such forecasts have led many scientists and policymakers to think that moving a large part of the nation's power supply to renewable sources—as cities from Miami Beach to Salt Lake City have promised to do—may not be as far-fetched as once thought. But like any debate, there are dissenters, including those inside the federal government. Their argument is that the nation demands an uninterrupted supply of electricity and cannot count on sun, wind and natural gas to provide it. “You need solid hydrocarbons(固体碳氢化合物) on-site for rising peak demand,” Environmental Protection Agency administrator Scott Pruitt said on Fox Business in May, referring to the importance of coal as a power source.

    Many experts say the government's concern fails to account for how the power grid(电网) has improved in recent decades. Utility companies(公共事业公司) have developed innovative ways to move electricity from place to place to account for variation in weather. Battery technology can store power for use when renewable sources cannot operate, meaning solar power can be used on days when the sun doesn't shine. And the nation's vast supply of natural gas can be turned into usable energy with the flick of a switch.

    “I don't think 5 or 10 years ago I'd be comfortable telling you we could not sacrifice reliability when we're going to have 35% of our energy come from wind,” said Ben Fowke, CEO of the utility company Xcel Energy, at a recent conference. “I'm telling you, I'm very comfortable with that today.”

    Indeed, many parts of the country are already close to that reality. In some regions, like Iowa and Kansas, renewable energy supplies more than 25% of the electricity. The market has shifted so far in favor of natural gas and renewable energy that even the most concerted federal effort is unlikely to stop its growth. Any attempt to slow the growth of wind and solar will face strong pushback. “If anyone wants to do away with it,” Republican Senator Chuck Grassley told Yahoo News of the federal government's potential cuts to wind energy, “he'll do it over my dead body.”

    But the federal government could slow the acceleration—and with billions of dollars in private and public investments at risk, the pace of change matters. Decisions made today will shape the future of the nation's energy grid for decades to come.

    Forty-three years seems like a long time to remember the name of a mere acquaintance. I have forgotten the name of an old lady who was a customer on my paper route. Yet it seems like just yesterday that she taught me a lesson in forgiveness.

    On a Saturday afternoon, a friend and I were throwing rocks onto the roof of the old lady's house. The object of our play was to observe how the rocks changed to missiles （导弹）as they rolled to the roof's edge and shot out into the yard like comets （彗星）falling from the sky. I found myself a perfectly smooth rock and sent it for a ride. However, it slipped from my hand as I let it go and headed straight for a small window. At the sound of crashed glass, we knew we were in trouble and ran away.

    A few days later, when I was sure that I hadn't been discovered, I started to feel guilty for her misfortune. She still greeted me with a smile each day when I gave her the paper, but I was no longer able to act comfortably in her presence. I made up my mind to save my paper delivery money, and in three weeks I had the seven dollars that I calculated would cover the cost of her window. I put the money in an envelope with a note, and put the envelope through the letter slot in her door.

    The next day, I handed the old lady her paper and was able to return the warm smile that I was receiving from her. She thanked me for the paper and said, “Here, I have something for you.” It was a bag of cookies. I thanked her and began to eat the cookies as I continued my route.

    After several cookies, I felt an envelope and pulled it out of the bag. When I opened the envelope, I was surprised. Inside were the seven dollars and a short note that said, “I'm proud of you.”

    As a little girl growing up in the early 1960s in a suburb of Pittsburgh, it was not always easy to find role models. But I was lucky. In my childhood, I knew smart, strong women who had accomplished much, one of whom invented the world's first computer compiler (编译器).

    Recently, though, I learned about a role model who was right under my nose—my own mother.

    Growing up, I knew she had worked as a secretary before I was born. I knew that she had joined the WAVES—the Women Accepted for Volunteer Emergency Service branch of the U.S. Naval Reserve (海军预备队)—during World War Ⅱ. And I knew she'd worked in an office that was involved with codes (编码). But when she talked about it—rare, because she had been sworn to secrecy—she described her duties as ordinary, routine. I never questioned it. After all, the woman I knew was a reserved suburban mom.

    Not long ago, a chance conversation with a colleague led me to the book, Code Girls. It tells the story of the WAVES, who decrypted (解码) and encrypted secret messages during the war. They worked around the clock, knowing that the lives of tens of thousands of soldiers—their brothers, husbands, fathers—were on the line.

    Inspired, I began a journey to explore the mystery of my mother's service that continues to this day. I got some of her working records about her unit, OP19. In two years, she was promoted three times. She was no secretary, and her duties were hardly ordinary.

    My mother always encouraged my interest in science and insisted to my father that I go to college. “You're going to grow up to be another Madame Curie,” she told me. She was always pointing at other women. She did not see herself as someone to model on. Neither did I. Now I see her differently.