Honey from the African forest is not only a kind of natural sugar, it is also delicious. Most people, and many animals, like eating it. However, the only way for them to get that honey is to find a wild bees' nest and take the honey from it. Often, these nests are high up in trees, and it is difficult to find them. In parts of Africa, though, people and animals looking for honey have a strange and unexpected helper—a little bird called a honey guide.

    The honey guide does not actually like honey, but it does like the wax(蜂蜡) in the beehives(蜂房). The little bird cannot reach this wax, which is deep inside the bees' nest. So, when it finds a suitable nest, it looks for someone to help it. The honey guide gives a loud cry that attracts the attention of both passing animals and people. Once it has their attention, it flies through the forest, waiting from time to time for the curious animal or person as it leads them to the nest. When they finally arrive at the nest, the follower reaches in to get at the delicious honey as the bird patiently waits and watches. Some of the honey, and the wax, always falls to the ground, and this is when the honey guide takes its share.

    Scientists do not know why the honey guide likes eating the wax, but it is very determined in its efforts to get it. The birds seem to be able to smell wax from a long distance away. They will quickly arrive whenever a beekeeper is taking honey from his beehives, and will even enter churches when beeswax candles are being lit.

    In the short time Steve and Zach had been inside their tent packing their tools, wind-blown flame had skipped from the top of one tree to another. The long dry summer had turned the forest into a tinderbox.

    "Let's go! We can make it back to the river we crossed today!" Steve kept Brady on the lead and their heads down against the fire-wind. But Brady barked a sharp warning. Ahead of them lay a thick curtain of smoke across the track. They would never make it through that. The dog was pulling at his lead trying to draw them away from the smoke, and yet Steve was uneasy. It seemed to him that they were moving away from the river.

    Suddenly, Zach cried. "Zach!" Steve shouted. "Are you OK? Where are you?" Then Brady pulled Steve down a sharp slope(坡). At its base, Zach was rubbing his ankle.

    As Steve helped his friend to his feet, Brady lifted his head and snuffed(嗅) the smoke-laden wind. Next moment, the dog bounded away and disappeared. The boys shouted for him, but he didn't come back. Steve couldn't blame Brady for panicking. He himself wanted to run even though he didn't have a clue which way.

    Steve and Zach hadn't gone far when there was a familiar bark, and Brady came bounding, stopped directly in front of Steve and hit him with his head, pushing him back toward the slope they'd just climbed. But Steve didn't get it. Then Brady grabbed the boy's jeans and started pulling. The message was clear, but Steve hesitated. Of course he remembered Brady saving his uncle's life when the dog was much younger. Was he still sharp enough to get them through this?

    Nearby, a pine went up in a whoosh of smoke. Brady pulled again, urgently. "OK, big guy," Steve gritted(咬紧牙关). Brady led them back down the slope and into the trees. Not far from them fire was touching underbrush. Several times the big dog stopped. Often he changed directions. Steve was so tired that he just wanted to rest, but Brady wouldn't have it. The dog bullied both boys to go on. How long they'd walked Steve had no idea. He was almost numb when he heard it—the wonderful sound of rushing water!

    Stocky, slow-moving whale, rarely grows beyond 15 metres in length

    Flippers are a third of body length; variable dorsal fin size and shape; saw-toothed trailing edge on flukes, often raised when diving

    Bumpy tubercles on top of head

    Body colour is dark brown to black; often extensive white on flippers and underside of body and flukes; such patterns enable individual recognition

    Bushy blow, occasionally V-shaped

    270-400 olive baleen plates

    Humpback whales belong to the rorqual (groove-throated) family, which includes fin, sei, Bryde's, minke and blue whales. The big family migrate between winter tropical breeding areas (North West Shelf, Great Barrier Reef, New Caledonia, Vanuatu, Fiii, Tonga) and summer Antarctic feeding areas. Once common in New Zealand waters, humpbacks are now rarely seen and may migrate further offshore. Males compete for mates either by physical fight or by song. Females give birth to their young every two to three years; some non-breeding females probably remain in the southern waters during winter. Young humpback whales return to their area of birth but in later life some wander between breeding areas. Humpbacks eat small shrimps and other schooling prey, such as fish, forming small, cooperative groups of two to three individuals to feed.

    Similar species: Easily identifiable due to a 'hump' back when submerging, but at a distance may be confused with other species that raise their flukes when diving, such as sperm, right and blue whales.

    Protection status: Recovering well from past whaling and now numerous in some former migration and aggregation areas, rarely seen in others.

    Bill Gates and the president of General Motors have met for lunch, and Gates is going on and on about computer technology. "If automotive technology had kept pace with computer technology over the past few decades, you would now be driving a V-32 instead of a V-8, and it would have a top speed of 10, 000 miles per hour," says Gates. "Or, you could have an economy car that weighs 30 pounds and gets a thousand miles to a gallon of gas. In either case, the sticker price of a new car would be less than $50.Why haven't you guys kept up?"

    The president of GM smiles and says, "Because the federal government won't let us build cars that crash four times a day."

    Why is that funny (or not funny, as the case may be)? Human beings love to laugh, and the average adult laughs 17 times a day. Humans love to laugh so much that there are actually industries built around laughter. Jokes, sitcoms and comedians are all designed to get us laughing, because laughing feels good. For us it seems so natural, but the funny thing is that humans are one of the only species that laughs. Laughter is actually a complex response that involves many of the same skills used in solving problems.

    Laughter is a great thing—that's why we've all heard the saying, "Laughter is the best medicine." There is strong evidence that laughter can actually improve health and help fight disease. In this article, we'll look at laughter—what it is, what happens in our brains when we laugh, what makes us laugh and how it can make us healthier and happier. You'll also learn that there's a tremendous amount that no one understands yet.

    A couple of weeks ago, my oldest son, 9-year-old Hayden, came home from school and told me about his friend Katie's blog. Then he asked, "Can I start my own blog?" I thought it was a great way for him to learn new things. So I asked, "What would you want to write about?" Then we had a chat about a few choices. Eventually, Hayden decided on a particular animal species so that he could help other school kids learn about them.

    That Friday night, we set up a blog for him and Hayden's Animal Facts was born. He has posted four times so far. As we talked about starting a blog, I thought about some problems of a child blogging. Here are a few of the considerations that I had.

    Blogging isn't a popularity contest. At first, Hayden cared too much about how many views he had. After a couple of discussions, he now realizes that it's more important to come up with helpful contents for those who want to learn more about animals.

    Online security. I'm concerned about online security, so I make sure that there isn't too much personal information about him.

    The value of persistence (坚持). In so many ways, blogging is like a marathon. Keeping blogging teaches him the value of persistence.

    Writing and spelling skills. Much to my surprise, Hayden is terrible at spelling. However, he loves writing, has a great imagination and is always working on little books, so hopefully the process of blogging will help him with his writing and spelling skills.

    If you live in Shanghai, you might have to take a "lesson" in sorting garbage, as the city recently introduced new garbage-sorting regulations. It's now required that people should sort garbage into four categories, namely recyclable, harmful, dry and wet waste. However, if people fail to sort their garbage properly, they can be fined up to 200 yuan. More cities are introducing similar regulations, following the practice in Shanghai. By the end of 2020, garbage-sorting systems will have been built in 46 major Chinese cities, including Beijing and Shenzhen, reported People's Daily.

    According to a study by the Policy Research Center for Environment and Economy, under the Ministry of Ecology and Environment, over 90 percent of the public believe that garbage sorting is important for the protection of the environment. However, garbage sorting is still a big problem in China. Only 30 percent of participants said they think they are adequately sorting their trash, the study noted.

    According to Xinhua News Agency, it's partly because many people lack the willingness to sort their own waste. In the past, some previous garbage regulations didn't give clear fines for people who failed to sort garbage. "It's a must to have a legal guarantee to promote garbage sorting." Liu Jianguo, a professor from Tsinghua University, told China Daily. He also added "the importance of the new regulations in Shanghai is to change the past voluntary action into compulsory action for everyone"

    Aside from China, many other foreign countries have also introduced garbage-sorting regulations. In Japan, waste sorting has become a basic survival skill, reported Xinhua. There is a fixed time for disposal of each kind of garbage and littering can result in high fines and even jail time. In Germany too, people are asked to sort waste into specific categories, reported HuffPost. For example, in Berlin, people have yellow bins for plastic and metals and blue bins for paper and cardboard.