It's a little hard to figure out the rules for sure,  but the baby African buffalo( 水牛) seems to have the upper hand. The two stand a couple feet apart, staring at each other. Behind them, their mothers look on with the kind of indifference(不关心) of mothers  everywhere who see their kids playing a harmless game.

    The alarm went off about half an hour ago, the second time tonight. Here, one bell means “elephant”, two, “rhino” (犀牛), and three and four, 1 really can't remember for what, because when you're awoken by bells in the middle of the night, your first thought won't be “Animal! ”.But as soon as I realized it was the rhino alarm.

    I was running for the stairs. Yet I'm the only one watching the animals stare-down. Either everyone else died of a heart attack when the bells went off, or l was the only one in the entire hotel who didn't turn the alarm switch to off before going to bed.

    The Ark, a hotel shaped like the biblical ark(圣经的方舟) , lies in the highlands of Kenya's Aberdare National Park, about 100 kilometers north of Nairobi. At the Ark's prow(船首) are huge windows overlooking a waterhole. Earlier tonight, I'd watched a pack of wolves, buffalos and elephants. And now, at three or so in the morning, I'm down for rhino bells. The first time, 2.5 hours ago, it was a single black rhino, which came down, got a drink, and left. I'd have been sorry for the lost sleep.  I've already arranged with a guide to take me out at sunrise for the so-called “should never miss” bird-watching, where we'll get to see 30 species, but really, how many times in your life will you get to wake up and say, “Wow! Rhino!”? Isn't that the definition of a pretty good night? Last week we went from Uganda into Kenya.  Before I left home, 1 thought I'd be happy with ten elephants and five or six giraffes on the whole trip. I didn't dare to dream the rhino.

    In an effort to inform our citizens to clear the street snow, the city adopts a snow removal plan.

    Routes used by City Emergency Services come first. Secondly, connector streets will be cleared which allow citizens the greatest access to public roads. And thirdly, roads within neighborhoods will be cleared.

    Snow removal and ice control will start when:

    Snow accumulates 4 inches or more.

    Weather conditions do not endanger the safety of road crew.

    Snow falls during peak traffic periods of heavy use of main streets.

    Snow and ice removal will be delayed or cancelled when:

    There is severe cold, significant wind and limited visibility.

    The snowfall occurs on the weekend or a holiday and is not considered a threat to public safety. In that case, snow and ice removal may take place on the next normal weekday.

    Snow and ice may be left on roadways if melting is obvious.

    Your cooperation is requested during snow removal and these suggestions may apply:

    Limit travel during storms. Travel is possible once roads have been cleared or salted by the road crew

    Avoid removing snow from your driveway into the road. Pile the snow in your yard.

    Park your vehicles in your driveways and off the road or walks.

    Keep public sidewalks next to your house clear of snow and ice.

    Be responsible for removing this snow which is thrown by the snow plough(犁) from your driveways. Hopefully, you can understand this inconvenience.

    English is the most widely used language in the history of our planet. One in every seven human beings can speak it. More than half of the world's books and three quarters of international mail are in English. Of all languages, English has the largest vocabulary — perhaps as many as two million words.

    However, let's face it: English is a crazy language. There is no egg in an eggplant, neither pine nor apple in a pineapple and no ham in a hamburger. Sweet-meats are candy, while sweetbreads, which aren't sweet, are meat.

    We take English for granted. But when we explore its paradoxes (探讨它的矛盾), we find that quicksand can work slowly, boxing rings are square, public bathrooms have no baths in them.

    And why is it that a writer writes, but fingers don't fing, grocers don't groce, and hammers don't ham? If the plural of tooth is teeth, shouldn't the plural of booth be beeth? One goose, two geese — so one moose, two meese?

    How can a slim chance and a fat chance be the same, while a wise man and a wise guy are opposites? How can overlook and oversee be opposites, while quite a lot and quite a few are alike? How can the weather be hot as hell one day and cold as hell the next?

    English was invented by people, not computers, and it reflects (反映) the creativity of human beings. That's why, when stars are out, they are visible (能看见的); but when the lights are out, they are invisible. And why, when I wind up my watch, I start it; but when I wind up this essay, I end it.

    You know those nutrition guidelines the government issues every few years? It turns out that following them isn't just good for your health. It's good for the planet, too.

    " What we found is that impacts vary across nations, but in the high­impact nations, in general, you can see that, if you follow a nationally recommended diet, despite the fact that these diets don't mention explicitly—or most of them don't explicitly mention—environmental impacts, that you are going to have lower environmental impacts due to that. So that's sort of fairly clear across all the high­income nations." said Paul Behrens, an environmental scientist at Leiden University in the Netherlands.

    The food we eat takes a big toll on the environment. A third of the ice­free land on Earth is used for agriculture, and according to some estimates, producing food accounts for roughly a fifth of all human­caused greenhouse gas emissions. Fertilizer runoff also leads to other problems, like the algae blooms in Lake Eerie and the Dead Zone in the Gulf of Mexico.

    However, following dietary guidelines would reduce those impacts, especially in wealthy countries like the US. "Most of the reductions come from meat and dairy," which have an outsized impact on land use and pollution, and are a major source of greenhouse gases.(That's partly due to cow farts. Seriously.) Following the suggestions would also mean eating fewer calories, since many people here eat more than they need.

    Overall, in high­income countries, Behren's team estimates that following the rules could result in as much as a 17 percent reduction in land use, a 21 percent reduction in nutrient pollution, and a 25 percent drop in agricultural greenhouse gas emissions. Cutting down on how much food we waste—which is roughly a third in the US—could help even more. The results are in the Proceedings of the National Academy of Sciences.

    Of course, people are notoriously bad at following diets. But: "These nationally recommended guidelines do actually have a knock­on effect on other areas of policy making. So if I'm developing a new healthy­eating­for­schools program then that's going to be based off a lot of detail that I get from the nationally recommended guidelines. So while it might not necessarily be the case that people follow directly …they actually are quite influential on the preparation of other advice."

    It seems that a smaller environmental footprint and a healthier lifestyle could go hand in hand.

    In Mexico, girls mark their fifteenth birthday with a celebration called Quinceanera. In the morning, the birthday girl goes to the church with her family and her best friends. She wears a beautiful dress. Later in the day, there is a huge party, with a big cake that matches the girl's dress, and a night filled with music and dancing.

    Becoming an adult is a very important life change, and Japan has a special holiday to celebrate this. The second Sunday in January is Coming-of-Age Day. On that day, everyone who had their twentieth birthday in the last year goes to their Town Hall for a special activity. Everyone dresses up, and many women wear beautiful dresses. The mayor makes a speech and gives presents to all the new adults.

    Some kids are afraid to start school, but six-year-olds in Germany can't wait. For them, Schulanfang is a big holiday. To celebrate a child's first day of school, parents or friends give the child a Zuckertuete, a big color box filled with candy and little presents. People take pictures of the kids holding their Zuckertuete, and there is a school party later for the parents with cake and coffee.

For hundreds of years, Africans have preserved their history through storytelling. But some Africans worry that oral traditions will be lost to the Internet connections and social media.

This has led a Nigerian woman named Elizabeth Kperrun to create a mobile phone application as a way to preserve African folk stories. She calls her mobile app AfroTalez, which tells children's stories that teach moral lessons.

"We can't teach kids something by telling them, 'Don't do this'. I think kids need context to understand. In a story somebody stole something and then something bad happened to them. Alternatively, somebody else did something good and they ended up happy or rich."

"Hello children. My name is Liz and I'd like to tell you a story about tortoises, elephants, and ..." The voice of "Aunt Liz" narrates the story, while a full-screen animation appears. An arrow signals when it's time to move on. There are also quizzes on object recognition and counting throughout.

Kperrun asks her older relatives to help her collect stories for the application. The stories come from an ethnic group living in southeast Nigeria and northwest Cameroon. "I want to keep it centered on folk stories, not the ones that Walt Disney has made really popular... It's fair and respectful to keep certain cultures alive because folk stories are part of the tapestry that keeps cultures together." Kperrun once said.

Kperrun writes and reads the stories. Her business partner and husband Idamiebi Ilamina-Eremie does the animation (动画).

AfroTalez is available for Android users and can be downloaded for free. So far, AfroTalez has more than 50,000 users. Funding for the app has been a major challenge. Kperrun hopes to use a crowdfunding campaign to help fund the next version of AfroTalez to be released soon.

Kperrun believes technology doesn't have to destroy or replace traditions. Her goal is to combine them to keep African culture alive. She says "Africa is our home, but we are so eager to become Western that we are forgetting things that are really important and should be passed on of who we are, and I don't think that's right."