It was Saturday morning. I heard loud noises of moving furniture in the next room. I could almost feel the excitement of John who was soon going to get a room of his own. I remember my own feelings when I was 13. I knew how much he longed for his right to privacy (私人空间) when he was sharing a room with his younger brother, Robot. He said, “Mum, Can I please have a room of my own? I could use Jeff's. He won't mind.”

    It was true that Jeff had graduated from college and flown from the nest. But would he mind? The room was the place where I told him a thousand stories and we had a thousand talks. As close as we were, though, the time came when Jeff needed a door between us. His life was spreading into areas that had less to do with family. I no longer could-or should-know everything about him.

It turned out that getting Jeff's permission was easy. He said, “Of course, Mum, it would be selfish of me to hold on to it.” Then his voice softened, “Mum, I won't be living at home again—you know that.” Behind his glasses, his eyes were lit with all the love. There were no doors closed here—they had all opened up again.

    As John and I were cleaning the room, I fixed my eyes on Jeff's things around me and could almost touch the little boy who I knew was gone forever. I looked at the room and, in my heart, I let it go. To hold on would be, as Jeff said, selfish. Now it was time for John, shouldering through the door, his eyes bright with promise of independence, to disappear behind the door. It was time for letting go to happen again.

    I travel a lot, and I find out different “styles” of directions every time I ask “How can I get to the post office?”

    Foreign tourists are often confused in Japan because most streets there don't have names; in Japan, people use landmarks（地标）in their directions instead of street names. For example, the Japanese will say to travelers, “Go straight down to the corner. Turn left at the big hotel and go past a fruit market. The post office is across from the bus stop.”

    In the countryside of the American Midwest, there are not usually many landmarks. There are no mountains, so the land is very flat; in many places there are no towns or buildings within miles. Instead of landmarks, people will tell you directions and distances. In Kansas or Iowa, for example, people will say, “Go north two miles. Turn east, and then go another mile.”

    People in Los Angeles, California, have no idea of distance on the map; they measure distance in time, not miles. “How far away is the post office?” you ask. “Oh,” they answer, “it's about five minutes from here.” You say, “Yes, but how many miles away is it?” They don't know.

    It's true that a person doesn't know the answer to your question sometimes. What happens in such a situation? A New Yorker might say, “Sorry, I have no idea.” But in Yucatan, Mexico, no one answers “I don't know.” People in Yucatan believe that “I don't know” is impolite. They usually give an answer, often a wrong one. A tourist can get very, very lost in Yucatan!

Life in the Clear

    Transparent animals let light pass through their bodies the same way light passes through a window. These animals typically live between the surface of the ocean and a depth of about 3,300 feet — as far as most light can reach. Most of them are extremely delicate and can be damaged by a simple touch. Sonke Johnsen, a scientist in biology, says, "These animals live through their life alone. They never touch anything unless they're eating it, or unless something is eating them."

    And they are as clear as glass. How does an animal become see­through? It's trickier than you might think.

    The objects around you are visible because they interact with light.  Light typically travels in a straight line. But some materials slow and scatter (散射) light, bouncing it away from its original path. Others absorb light, stopping it dead in its tracks.  Both scattering and absorption make an object look different from other objects around it, so you can see it easily.

    But a transparent object doesn't absorb or scatter light, at least not very much. Light can pass through it without bending or stopping. That means a transparent object doesn't look very different from the surrounding air or water. You don't see it — you see the things behind it.

    To become transparent, an animal needs to keep its body from absorbing or scattering light. Living materials can stop light because they contain pigments (色素) that absorb specific colors of light. But a transparent animal doesn't have pigments, so its tissues won't absorb light. According to Johnsen, avoiding absorption is actually easy. The real challenge is preventing light from scattering.

    Animals are built of many different materials — skin, fat, and more — and light moves through each at a different speed. Every time light moves into a material with a new speed, it bends and scatters. Transparent animals use different tricks to fight scattering. Some animals are simply very small or extremely flat.  Without much tissue to scatter light, it is easier to be see­through. Others build a large, clear mass of non­living jelly­lie (果冻状的) material and spread themselves over it.

    Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light exactly as much as water does. They need to look uniform. But how they're doing it is still unknown. One thing is clear for these larger animals, staying transparent is an active process.  When they die, they turn a non­transparent milky white.

    A dog found swimming more than 220 kilometers off the coast of Thailand has been returned safely to land.

    Late last week, workers on an oil rig (钻井平台) noticed the animal, all alone, in the water. It began swimming toward the side of the rig. The dog was able to get itself onto a solid area.

    He appeared cold, tired and fearful. The workers lowered a rope and secured it around the dog. Then, they worked together to pull the animal up to safety.

    The crew that found the dog quickly gave their new friend a name: Boonrod. The name means something similar to one who survives in a disaster in the Thai language.

    One of those workers was Vitisak Payalaw. He has been providing updates on Boonrod on his Facebook page. He said it was lucky that the crew noticed the dog in the water. If there had been waves, he said, the animal would not have been seen.

    No one knows how Boonrod ended up all alone at sea, or how long he had been out there. But Vitisak and others have guessed the animal might have fallen off a fishing boat.

    On Monday, Boonrod arrived on dry land. A team of animal doctors was waiting for him in the southern Thai province of Songkhla. Workers at the Songkhla port also welcomed the dog with neck rubs and a special welcome necklace made of yellow flowers. Many people took pictures with Boonrod.

    Vitisak wrote on Facebook, Today (April 15), a ship transporting the dog arrived onshore at around 10.am. His overall condition has improved. He is getting stronger and can smile.

    The dog is now in the care of an animal doctor in Songkhla. The animal protection group Watchdog Thailand said he is in good condition and getting stronger. On Tuesday, the group published pictures of Boonrod getting washed—and getting plenty of love and attention.

    Vitisak says that if no one claims Boonrod as their pet, he will take him with him to his home in northeast Thailand.

    Want a wonderful travel in London? Don't miss the following!

    The Guards Museum

    The Guards Museum was created as an educational tool for the newest intake of the Guards and includes exhibits of uniform for the five Roval regiments (团) dating from the Civil War, with details of the nature and origin of their ceremonial duties right up to their contemporary role. To anyone interested in these world-famous soldiers this London tourist attraction is a must-see.

    Telephone: 020 7414 3428

    Toy theatre

    Toy theatre (or paper theatre) was most popular in the 1800s, and consists of paper theatres, some with an extraordinary level of detail, allowing children to stage their own productions at home, usually with cut-out sheets of figures for the scenery, props (道具) and various characters in the play.

    Telephone: 020-7967-1066

    Charles Dickens Museum

    The Charles Dickens Museum, an author's house museum at Doughty Street, is a celebration of one of the greatest novelists in British history. The museum exhibits over 100, 000 items from personal items to artworks (艺术品) from some of his books. It is said that Dickens wrote 3 of his most famous stories while living here, Oliver Twist, Nicholas Nickleby and The Pickwick Papers. The building is the writer's only surviving London house and we can get to know what life in the household would have been like.

    Telephone: 020-7405-2127

    Foundling Museum

    The Foundling Museum was originally one of the first houses in London for abandoned children and housed over 27, 000 children before its closure (关闭). Since then this London attraction has transformed (转化) itself into one special London museum with a large collection of artworks and social history relating to the children taken in and the terrible social problems that led to children being abandoned by their parents.

    Telephone: 020-7841-3600

    Theater Listing Guide

    Check out the latest shows in London theaters with our handy theater listing guide! You can either purchase tickets at the theatre or online at https://www.londontheatre.co.uk/whats-on.

    Chicago, Phoenix Theatre

    Chicago, the longest-running American musical in Broadway history, has delighted audiences around the world. The main characters are two female criminals. You must be 18 or older to purchase a ticket.

    Kinky Boots, Adelphi Theatre

    Based on the successful 2005 British film by Geoff Deane and Tim Firth, this musical celebration is about the belief that you can change the world when you change your mind. Fans of musical comedy won't want to miss this fabulous show, as the songs in the musical were produced by Grammy and Tony winning pop icon Cyndi Lauper. No children younger than 6 will be admitted. Children under 3 are tree except in reserved seating.

    King Lear, Duke of York's Theatre

    Acting legend Sir Ian McKellen starred the title character in King Lear, one of Shakespeare's famous tragedies. McKellen's performance in the play, which sees King Lear become mad as he divides his kingdom amongst his children, was highly praised by critics and audiences. You must be 12 or older to enter the theatre.

    Les Miserables, Queen's Theatre

    Adapted from the epic novel by Victor Hugo, the musical tells a powerful and moving story of love, sacrifice, passion and revolutionary spirit. In October 2015 Les Miserables celebrated its 30th Anniversary in London and is now the world's longest-running musical. It is recommended for children aged 7 or over, and children under 5 are prohibited.