People often say that there is nothing in the world that can be as great as a mother's love. Some mother expressions mean just that. The phrase "mother lode" comes from mining. It means the place where the largest amount of gold can be found. But now, the term "mother lode" means a rich supply of anything. For example, you might say, "She just graduated from college and struck the mother lode with her new job!"

    When we call something "the mother of all", this means it is the biggest or best of something. Here is an example: "We are going to throw the mother of all parties this weekend. So you have to come!"

    Naturally, the word "mother" can be used to mean to give birth, even to something you cannot touch, such as an idea or wisdom. The saying "necessity is the mother of invention" means that when people really need to do something, they will find a way to do it. And "experience is the mother of wisdom" means that people learn from what happens to them.

    You might think all expressions about mothers are sweet and loving. Not so. A boy who is "tied to his mother's apron strings(围裙带)" is controlled by his mother. We can also call him a "mama's boy". Both of these terms are even more insulting(侮辱人的) if you are talking about a man, not a young boy. It can be a huge mistake for a woman to marry a "mama's boy" who is still "tied to his mother's apron strings".

    A show about mothers would not be complete without talking about the very popular but mysterious "Mother Goose". The short poems and songs that "Mother Goose" wrote are a part of growing up in the United States. Real or not, you could say "Mother Goose" is the mother of all nursery rhyme(童谣) writers.

    Road trip

    Motorhome delivery offers great family holidays. For just $1 a day, you can hire a fully﹣equipped motorhome, which you deliver to a specific destination within some days and kilometers. You then hire another one to get home or take a bus or train. Your only other expense will be fuel and about﹩20 a day for parking fees. To learn more, visit apollocamper.com.

    Plan ahead

    For a comfortable break, flexibility with times, dates and places helps lower the cost. Find a few hotels you like, ask about their vacant rooms, then wait a few weeks and call again. If they still have rooms, you're at an advantage to ask for a better price. Lots of last﹣minute deals are online. Watif （watif.com.au） has deals on hotels that have dropped their prices so slow. You don't know where you're staying until it's booked, but anywhere with four or five stars has to be fairly good.

    Back to nature

    Wild camping appeals to nature lovers and costs nothing. This is forbidden on beaches and parks in most urban areas, but you can turn up in more distant area as long as nobody owns the land. You'll need to take everything with you and may need to shop on eBuy （ebuy.com.au）.If you're a camping beginner, be aware of safety measures and get your questions answered on the Internet.

    Swap meet

    How about a home swap？For a $250 yearly joining cost, you can stay in someone's home in an international place of your choice while they or someone else stays in yours. Find out more at familylink.com.au.

Dark Sky Parks around the World

    Warrumbungle National Park

    Situated in the central west slopes of New South Wales is Australia's only dark sky park, Warrumbungle. The park has served as a dark sky park since July 2016. Its crystal-clear night skies and high altitude make it a natural, educational, and astronomical heritage site in the southern half of the earth. Tourists can use Australia's largest optical telescope within the park boundaries to view the auroras (极光), the Milky Way, and faint shooting stars.

    Sark

    Sark is a Channel Island near the coast of Normandy under the protection of the UK. It was the World's First Dark Sky Island set up in January 2011. Its historical and cultural blend attracts over 40,000 tourists annually. With no motor vehicles and public lighting on the island, there is an exceptional view of the dark skies. A rich Milky Way is visible in the dark night skies from the shores of the island.

    Pic du Midi de Bigorre

    Pic du Midi de Bigorre in France was designated as a dark sky park in December 2013 making it the second largest dark sky park in the world. The park covers 3. 112 square kilometers spread across the Pyrenees National Park and UNESCO's World Heritage site, Pyrenees-Mont Perdu. The park attracts over one hundred star watchers every year. The Observatory Midi-Pyrenees, which was built in 1870, is one of the world's highest museums at a height of 2,877 meters above sea level.

    Ramon Crater/Makhtesh Ramon

    Ramon Crater is a unique 1,100-square-kilometer nature reserve located in the Negev Desert in Israel. In 2017, the Ramon Crater became the first designated dark sky park in the Middle East. Its location, rough climate, and forbidding landscape that are characteristic of the Negev have largely defeated historical attempts for human settlement, making it a great place to view the night skies. Stargazers usually camp in the desert to have an uninterrupted view of the stars, planets, and the Milky Way.

    The problem of robocalls has gotten so bad that many people now refuse to pick up calls from numbers they don't know. By next year, half of the calls we receive will be scams(欺诈). We are finally waking up to the severity of the problem by supporting and developing a group of tools, apps and approaches intended to prevent scammers from getting through. Unfortunately, it's too little, too late. By the time these "solutions" become widely available, scammers will have moved onto cleverer means. In the near future, it's not just going to be the number you see on your screen that will be in doubt. Soon you will also question whether the voice you're hearing is actually real.

    That's because there are a number of powerful voice manipulation (处理) and automation technologies that are about to become widely available for anyone to use. At this year's I/O Conference, a company showed a new voice technology able to produce such a convincing human-sounding voice that it was able to speak to a receptionist and book a reservation without detection.

    These developments are likely to make our current problems with robocalls much worse. The reason that robocalls are a headache has less to do with amount than precision. A decade of data breaches(数据侵入)of personal information has led to a situation where scammers can easily learn your mother's name, and far more. Armed with this knowledge, they're able to carry out individually targeted campaigns to cheat people. This means, for example, that a scammer could call you from what looks to be a familiar number and talk to you using a voice that sounds exactly like your bank teller's, tricking you into "confirming" your address, mother's name, and card number. Scammers follow money, so companies will be the worst hit. A lot of business is still done over the phone, and much of it is based on trust and existing relationships. Voice manipulation technologies may weaken that gradually.

    We need to deal with the insecure nature of our telecom networks. Phone carriers and consumers need to work together to find ways of determining and communicating what is real. That might mean either developing a uniform way to mark videos and images, showing when and who they were made by, or abandoning phone calls altogether and moving towards data-based communications — using apps like FaceTime or WhatsApp, which can be tied to your identity.

    Credibility is hard to earn but easy to lose, and the problem is only going to get harder from here on out.

    Throughout history scientists have risked their health and their lives in their search for the truth.

    Sir Isaac Newton, the seventeenth century scientist, was very smart, but that didn't stop him from doing some pretty stupid things. In his laboratory in Cambridge he often did the strangest experiments. Once, while testing how light passes through lenses (晶状体), he put a long needle into his eye, pushed it to the back, and then moved it around just to see what would happen. Luckily, nothing long-lasting did. On another occasion he stared at the sun for as long as he could bear, to discover what effect this would have on his sight. Again he escaped suffering permanent damage, though he had to spend some days in a darkened room before his eyes recovered.

    In the 1750s the Swedish chemist Karl Scheele was the first person to find a way to produce phosphorus (磷). He in fact discovered eight more chemical elements including chlorine (氯), though he didn't get any praise for them. He was a very clever scientist, but his one failing was a curious habit of tasting a little of every substance he worked with. This risky practice finally caught up with him, and in 1786 he was found dead in his laboratory surrounded by a large number of dangerous chemicals, any of which might have been responsible for his death.

    Eugene Shoemaker was a respected geologist. He spent a large part of his life studying craters (火山口) on the moon, and how they were formed, and later did research into the comets of the planet Jupiter. In 1997 he and his wife were in the Australian desert where they went every year to search for places where comets might have hit the earth. While driving in the Tanami desert, normally one of the emptiest places in the world, another vehicle crashed into them and Shoemaker was killed on the spot. Some of his ashes (骨灰) were sent to the moon aboard the Lunar Prospector spacecraft and left there — he is the only person who has had this honor.

    Can you imagine being able to remember every single experience of your life and every word in your favorite book? That's what Becky's life is like, and as wonderful as it sounds, it can also be quite terrifying at times.

    Three years ago  Becky was reading a newspaper article which mentioned that it was impossible for people to remember the details of their life in the first three years. "What nonsense (胡说八道)!" she thought, because she could clearly remember her life all the way back to when she was just 12 days old. Her parents had carried her to the driver's seat of their car and laid her down for a photo. But it wasn't nonsense. She was just one of only 80 known people who have a condition called HSAM(Highly Superior Autobiographical Memory).

    Becky's unusual condition was recently shown on a program called 60 minutes, where reporter Allison tested her ability by asking her questions about her favorite book series, Harry Potter. Allison would pick up a book and open a page and read her a line. Immediately Becky would name the book, chapter number, chapter name and could recite every word until Allison told her to stop.

    Being able to remember every little detail is a great ability, but as every person with HSAM will tell you, it can be very hard to deal with. Forgetting is one of the things we use to get over sad experiences in our lives, but it's something that people like Becky are unable to do. Even walking on the street and lightly bumping(撞) into somebody brings back memories from Becky's childhood, when a boy knocked her over. She's taken right back to that time, living the experience all over again. Also, like Becky, people with HSAM never do well in school, because they have problems filtering(过滤) through all the information, remembering only the important bits.

    Becky's special brain could help scientists find a way to treat people with terrible illnesses like Alzheimer's. Her condition could hold the secret to treating or even preventing Alzheimer's.