Last week, we talked about the conflict(冲突) between sleepy teenagers and early morning classes. Many people commented(评论) on our website.

For example, Damla Ece in Turkey wrote: I agree with the idea of starting lessons later so teenagers can feel better in the morning. But sleeping more than seven hours can be wasting time for students.

    Tran in Vietnam disagreed: I think teenagers, on average, need eight to ten hours of sleep every day. It's useless to try to force them to concentrate while they can't concentrate.

    Afshin Heydari from Iran wrote: schools should start early to avoid heavy traffic later in the morning.

    And Suze from Jordan wrote: When I was a teenager, I enjoyed taking my courses as early as possible. That way I could find a long time in the day to do my own activities.

    But Azra from Kyrgyzstan said: the reason why schools start early here is a lack of classrooms.

    And Joruji in Japan wrote: When I was a teenager, I used to get up before six to go to school, which was far from home, and I don't remember having problems. I think nowadays the Internet, TV games and cell phones make teens go to sleep later.

    Thirty-year-old Kika in Spain said: In my opinion, young people are very lazy.

    But Dennis Jin disagreed: For high school students in China, we must reach the classroom at 6:20 in the morning and be back home usually at 10:00 in the evening. Then we'll have some extra schoolwork to do. Can you imagine how long we could sleep every day?

    Teenagers are not the only ones who suffer. Kathy in Canada wrote: My daughter likes complaining about everything in the morning, and I know that this is from lack of sleep. I wish schools should change their start time to 8:30 or 9:00 in the morning.

    And Naima Star in Libya wrote: Getting up so early in the morning and leaving the warm bed is so difficult, especially in the cold weather. It reminds me of that old song: "It's nice to get up in the morning, but it's nicer to stay in bed."

    Elephants in Uganda are starting to come close to villages near national parks. The big animals are a real danger to people.

    So, the Uganda Wildlife Authority has been giving people new tools to keep the elephants away: vuvuzelas. They are plastic instruments some fans use at sports events.

    The instruments make a loud sound elephants do not like. The animals leave, and no one is harmed. A spokesperson for the Uganda Wildlife Authority says vuvuzelas work because they do not threaten the elephants. That is important because an elephant that feels threatened is more likely to attack. So far, no one has reported an elephant attacking in answer to a vuvuzela.

    Officials and villagers have tried other ways to stop elephants from coming near farms and houses. They have built beehives – houses for flying insects that sting. They have hung ropes covered in spicy oil. They have dug long, deep holes. And they have used guns, called A-K47s.

    An official from the Uganda Wildlife Authority explains that people shoot the gun in the air to scare the elephant. But over time, the elephants have stopped being afraid of the sound of the gun. They only look at the shooter and wave their ears.

    Another official for the Uganda Wildlife Authority, Gessa Simblicious, says one elephant-prevention solution will not work everywhere in Uganda. And one day, elephants may accept the vuvuzela noise, just as they do the sound of the A-K47.

    But right now, vuvuzelas are an effective, non-violent and fun way to deal with a serious problem.

    The UK has a whole host of things to do for free or at a low price and there are a number of websites devoted to bringing you the best. Take a look at our guide to some of our favorite UK cities.

    London

    If you live in or near London and have access to the Internet, you'll discover many choices of free entertainment. The Londonist is an amusing website that offers daily and weekly breakdowns of the free and cheap events in the city. Categories include art, comedy, music, food and drink, theatre, festivals and talks. Head over to Londonist.com for the latest schedule of affordable entertainment. Time Out's website (Timeout, com/London) also has lots of information about free fun in the lively capital.

    Find out why the 60s really cemented(巩固) London as counterculture capital of the UK in our shop.

    Manchester

    Manchester is probably one of the top creative centers of England (if not the UK). If you need any further convincing evidence, then head over to Creative Tourist, where you can find bags of daytime and nighttime entertainment that's easy on the pocket. While you're there you can also check out Liverpool and Sheffield.

    Manchester is a historical city, which has shaped life in Britain. Take a look in our shop.

    Glasgow

    If Manchester is the creative center of England then Glasgow has to be the creative center of Scotland. You can visit Scotland's Center for Design and Architecture at The Lighthouse, or go over to the Gallery of Modem Art, and then there's the wonderful and strange Hunterian Museum. For a lowdown on the best free of Glasgow, take a look at VisitScotland.

    For a look at Glasgow's picturesque qualities click here.

    Pizza is a pretty universal treat, but where did it start? Here are three things you probably didn't know about pizza.

    1: Pizza's Origins Are Half-Baked.

    The Neapolitans（那不勒斯人）in Italy are proud of saying they invented pizza, but it's probably more accurate to say, they perfected it. The idea of putting toppings on a flatbread and baking it started in the 6th century B. C. But the people of Naples were the first to put tomato on a flatbread in the 16th century. From its start, pizza was a food of the poor, as it was cheap, filling and easy to eat on the run. In Italian, the word “pizza” refers to anything that is made and then pressed flat.

    2: Pizza Margherita Is Not Exactly a Symbol of Italy.

It was said some day in 1889, a local baker named Raffaele Esposito created three pizzas for Queen Margherita when she was on a tour of Italy. The queen loved the version that had tomato, basil and mozzarella cheese— and just happened to match the colors of the Italian flag. So Esposito named the pizza after her.

    But Pizza historian Scott Wiener points out that Italy was unified in name only in 1889 so it was unlikely any Neapolitan baker would want to celebrate “the Northern conquerors.” Further, the letter of gratitude for the pizza from the royal household that Pizzeria Brandi displays appears to be a fake（赝品）and may just have been a marketing plan.

    3: Hawaliian Pizza Invented by a Canadian.

    Sam Panopoulos, from Greece originally moved to Canada at the age of 20. In 1962, he decided to put some ham and pineapple on a pizza at one of his restaurants in Ontario.

    “We just put it on for fun to see how it was going to taste,” he told the BBC in 2017. Panopoulos named it the Hawaiian pizza after the brand of canned pineapple he used. The mix of sweet and savory toppings caught on with a certain part of the pizza-loving public. The inventor died in 2017.

    I was in the Sants Cruz Mountains not long ago, speaking and singing at a women's conference. We were focusing on the theme of loving others in practical ways through our gifts, and something in particular happened during one of the sessions（会议）will remain imprinted in memory.

    A young Syrian woman (Lilith) was invited to the conference at the last minute, and everyone seemed surprised and delighted that she'd actually come. Just a few days earlier, Lilith had fled her country and found refuge with one of the women attending the conference. As an Orthodox Christian in Syria, she and her loved ones had become attacked targets of violent terrorist groups in the country's ongoing civil war.

Lilith had witnessed horrors no one of her young age should ever see. Despite the further danger it presented, she'd decided to leave her home and her family to find safety here in America. Knowing some of her story, and seeing her sitting through the sessions at the retreat（畏缩不前）—head, covered in a scarf, bowed toward the floor—broke my heart.

    Lilith's story touched all of us, including Pam, who was quilt maker. Pam had just finished a beautiful quilt, and had brought it with her. She, along with a few of the leaders, decided to give it to Lilith as a symbol of their comfort and love.

During our last session, Lilith was called forward and prayed over, hugged, and wrapped up in that beautiful quilt. I thought of the many hours Pam undoubtedly spent working on it, and the terrible events that led Lilith to this moment—surrounded by the beauty and love quilt embodied. I wept. When they told her it was for her, she wept.

    The koala is an unusual creature. Native to Australia and a bit bigger than a rabbit, it spends most of its time in eucalyptus trees（桉树）, feeding on leaves that are poisonous to nearly every other animal on the planet.

    The koala sleeps about 22 hours a day and spends the remainder of its time eating and resting. It might spend 10 minutes a day moving, experts say, usually from one tree to another. It has a soft pad at the end of its spine and extra thick fur on its rear end to make the effort, of sitting more comfortable.

    Threats and protective measures

    The unique lifestyle of the koala has helped it prosper, but today the cute and iconic creature is facing threats from habitat loss, disease and a changing climate. Koala populations are expected to decline by 50 percent in the next 20 years according to the Australian Museum.

    To help protect these animals, which bring in an estimated $1.1 billion to Australia each year through koala-related tourism, an international team of researchers has published the first complete genome（基因组）of the koala. Their hope is that the keys to the marsupial's（有袋动物）long-term survival might be planted in its genetic code.

"The ultimate goal is that we won't have to…rescue them from the edge of extinction," said Rebecca Johnson of the Australian Museum Research Institute in Sydney, who led the work.

    "Now we have a really good understanding of the koala genome, and we are in a fantastic position to use that knowledge to help us manage them."

    Early findings

    An elementary analysis of the koala's genome, published in Nature Genetics, has already yielded some interesting findings.

    For example, the authors found that, compared to other mammals, the koala's DNA includes an expansion in the number of genes that encode for enzymes involved in anti-poison. That allows them to have a diet that depends almost entirely on eucalyplus leaves which are unusually high in poison. However, it also means that koalas metabolize（代谢）medicines like anti-chlamydia antibiotics faster than other animals.

    The koala genome also revealed why koalas are such famously picky eaters. They are known to consume leaves from just 20 of Australia's 60 known eucalyplus species. And even when they are in one of their preferred trees, koalas take leaf selection very seriously.

    Information waiting to be discovered

    Johnson said that the information encoded in the koala's DNA is already being included in management strategies by conservation groups. However, she said the findings described in the new paper represent the early stages of what can be gleamed from the marsupial's genome.

    "The data is public, and I would love for anyone to start mining it and see what other amazing things they can find," she said." Once you have a genome of this quality, the sky's the limit with what you can do with it."