In 2004 ,when my daughter Becky was ten , she and my husband ,Joe, were united in their desire for a dog . As for me , I shared none of their canine lust.

But why , they pleaded. “Because I don't have time to take care of a dog.” But we'll do it. ” Really? You're going to walk the dog? Feed the dog? Bathe the dog?” Yes, yes , and yes .”I don't believe you .” We will . We promise.

They didn't . From day two (everyone wanted to walk the cute puppy that first day ) , neither thought to walk the dog . While I was slow to accept that I would be the one to keep track of her shots , to schedule her vet appointments , to feed and clean her , Misty knew this on day one . As she looked up at the three new humans in her life (small, medium, and large) , she calculated ,”The medium one is the sucker in the pack .”

Quickly, she and I developed something very similar to a Vulcan mind meld (心灵融合) . She'd look at me with those sad brown eyes of hers , beam her need , and then wait , trusting I would understand — which , strangely , I almost always did . In no time , she became my feet as I read , and splaying across my stomach as I watched television .

Even so , part of me continued to resent walking duty .Joe and Becky had promised. Not fair , I'd balk (不心甘情愿地做) silently as she and I walked . “Not fair , ” I' d loudly remind anyone within earshot upon our return home .

       Then one day — January 1, 2007 , to be exact — my husband ‘ s doctor uttered an unthinkable word : leukemia ( 白血病) .With that , I spent eight to ten hours a day with Joe in the hospital , doing anything and everything I could to ease his discomfort. During those six months of hospitalizations, Becky, 12 at the time, adjusted to other adults being in the house when she returned from school. My work colleagues adjusted to my taking off at a moment's notice for medical emergencies. Every part of my life changed; no part of my old routine remained.

      Save one: Misty still needed walking. At the beginning, when friends offered to take her

through her paces, I declined because I knew they had their own households to deal with.

      As the months went by，I began to realize that I actually wanted to walk Misty. The walk in the morning before I headed to the hospital was a quiet, peaceful time to gather my thoughts or to just be before the day's medical drama unfolded. The evening walk was a time to shake off the day's upsets and let the worry tracks in my head go to white noise.

      When serious illness visits your household, it's , not just your daily routine and your assumptions about the future that are no longer familiar. Pretty much everyone you acts differently.

Not Misty. Take her for a walk, and she had no interest in Joe's blood counts or 'one marrow test results. On the street or in the park, she had only one thing on her mind: squirrels! She Was so joyous that even on the worst days, she could make me smile. On a daily basis she reminded me that life goes on.

      After Joe died in 2009，Misty slept on his pillow.

I'm grateful一to a point. The truth is, after years of balking, I've come to enjoy m' walks with Misty. As I watch her chase after a squirrel, throwing her whole being into the here-and-now of an exercise that has never once ended in victory, she reminds me, too, that no matter how harsh the present or unpredictable the future , there's almost always some measure of joy to be extracted from the moment.

    Gardening is popular in many parts of the world. This outdoor activity gives us beautiful plants, pleasant smelling flowers and fresh fruits and vegetables. But it also does a lot of good to our health.

    Gardening connects people. When you are gardening, you are outdoors. So it is a perfect chance to meet and spend time with your neighbors. Most people love to talk about their hobbies, and gardeners are no different. They usually enjoy showing people what they are growing. And most enjoy sharing advice and stories about their gardens almost as much as sharing flowers and vegetables from their gardens.

    Gardening is a great activity for children. It gets them outdoors and off computers, televisions and cell phones. Gardening is also a great teacher. It can teach a child about where food comes from and healthy eating. It also helps them to understand that the natural resources (资源) are not inexhaustible and the importance of using them carefully.

    Then, when you garden, you must move around. All the different movements needed for gardening, like bending and lifting, work small muscles (肌肉) in the body. And you can easily get good exercise when you are digging holes or pulling grasses.

    In a study, researches looked at more than 2,800 people over the age of 60. They studied their lifestyle habits, activities and health over a 16-year period. They found that gardening could lower the risk of future dementia (痴呆) by 36%. Gardening requires people do many repeated actions, such as picking off dying flowers. These actions have a calming influence on the brain. The brain is still active but not in the same way when we use computers.

    You'll feel wonderful when what you grow in a garden looks, smells, feels and tastes good.

    There lived in South Carolina a young woman named Eliza Lucas. Her father was governor of one of the islands of the West Indies. Miss Lucas often got seeds from her father, and then she planted them in South Carolina.

    Once, her father sent her some seeds of the indigo (靛蓝) plant. She planted some of them in March, but a frost (霜冻) came and killed all her plants. However, she decided to plant some more seeds in April. These grew very well until a cutworm found them and ate her plants. Once more Miss Lucas planted some of the seeds. This time the plants grew very well. She wrote to her father about it. He sent her a man who knew how to get the indigo out of the plant.

    However, the man tried not to show Miss Lucas how to make the indigo. He did not want the people in South Carolina to learn how to make it. He was afraid his own people would not get so much money for their indigo if other people made it as well. So he destroyed the indigo on purpose. But Miss Lucas watched him closely. She worked out how the indigo could be made. Some of her father's land in South Carolina was now planted with the indigo plant.

    Then Miss Lucas got married, and became Mrs. Pinckney. Her father gave her all the indigo growing on his land in South Carolina. It was all saved for seeds. Mrs Pinckney gave some of the seeds to her friends while her husband sowed others. They all grew and were made into the blue dye(染料) that we call indigo. In a few years, South Carolina was producing more than a million pounds of indigo every year. All the people were grateful to her.

    Kendrick Lamar hasn't had much luck when it comes to winning a Grammy. But that's OK： The US rapper(说唱歌手) has just won a Pulitzer Prize for his music.

    In 2014, in 2016, and again this year. Lamar was nominated (提名)for an album of the year Grammy. Each time, he was beaten out, first by Taylor Swift, next by Daft Punk, and most recently by Bruno Mars.

    But the Pulitzer Prize committee was inspired enough by Lamar's 2017 album, Damn, to award the 30-year-old its Pulitzer Prize in music on April 16. It's an amazing album that documents the real life of modem African-Americans in South Los Angeles with wildly accomplished beats and rhythms.

    Lamar's win is considered to be historical. 'The Pulitzers have long displayed their preference toward high art rather than the pop culture of the masses. So it's not just that no rapper has ever won a Pulitzer: no pop music maker has ever won one in the award's 75-year history.

    But Lamar is not just a singer—he's clever at using language. Like the best writers, his music describes small moments that illustrate (阐明) larger points. His songs are about his experience as a black man who grew up in California, struggled, got into trouble, and found his way out by working hard and making sense of the history and reality of racial problems in the US.

    “He's an artist who challenges idea,” said Ryan Coogler, director of the blockbuster(大片) hit Black Panther, for which Lamar created music. "One big theme in our film of,' What does it mean to be African?' Kendrick in his music is very exactly and directly challenging that question."

    Good artists entertain us, great artists make us think, and exceptional artists help us empathize (感同身受) .

    There are a lot of good, great, even exceptional artists in rock, pop, country, and hip-hop. But only Lamar has a Pulitzer Prize.

    Are you a morning person? You might not like the findings in this new research.

    From a lack of air and drinking water to solar radiation, theoretical Mars pioneers face any number of potential obstacles to settling on the red planet. Now, scientists have found something else to add to the list: seriously messed-up biological clocks.

    One day on Mars - which scientists refer to as the solar day, or “sol”- is 37 minutes longer than a day on Earth. A team of European scientists recently demonstrated why that could be a problem.

    Circadian rhythms are the body's natural cycles of rest and waking, which tend to follow roughly 24-hour light-dark cycles. These natural rhythms - which play a role in biological functions including brain wave activity and hormone production - can be interrupted by things like jet lag（时差）and night shift work.

    For the study, the researchers compared mice with healthy, 24-hour circadian clocks to mice with a genetic change that caused them to have shorter, 20-hour circadian clocks. The mice with healthy biological clocks were more likely to survive and reproduce, while the mice with shorter biological clocks were more likely to die off.

    What does this all have to do with space travel? Since the Martian sol is longer than a day on Earth, people with shorter circadian clocks could suffer from health problems as they try to adapt to the rotational speed of the red planet.

    Unfortunately, the body is unlikely to adapt to the new conditions or “learn” to develop a longer clock. As Loudon explained,“ Learning is not a likely option.”

    In other words: Sorry, super-early risers - NASA might not want you for the next Mars mission.

    Hadi Partovi, founder of Code.org believes every student should learn the basics of computer science just like they do math, physics, or biology, regardless of what they want to do in the future. The expert says knowledge about the subject is important to understand how the world around us works and compares it to learning about photosynthesis(光合作用), even though not every student is going to be a botanist. To spark students' interest, he created the “Hour of Code,” which introduces the world of computing to anyone, from ages 14 to 104, in a fun, interactive manner. Observed annually during Computer Science Week, the event now draws tens of millions of kids from over 180 countries.

    The “Hour of Code”, which can be scheduled anytime during Computer Science Week, begins with an introductory video on computer science. Participants can then select from hundreds of fun assignments that are sorted by both grade level and coding experience. Though each project is designed to last just sixty minutes, beginners can deal with as many challenges as they desire.

    To help introduce computer science in classrooms on a more regular basis, Code.org has also developed a catalog of online courses that can be incorporated(纳入)in a school's regular curriculum. Since the nonprofit began offering the courses in 2013, over 704, 000 teachers have signed up to teach introductory computer science to over 22 million students worldwide.

    Thanks to the efforts of the pioneer, about 40 percent of US schools now offer computer science as a subject. The numbers are even higher—an impressive 70 percent—if after-school offerings such as robotics clubs are included. Even more encouraging, eight years ago, just 19, 390 students took an Advanced Placement Computer Science exam. By the spring of 2017, the number had jumped 415 percent to 99, 868.