Tips for Getting the Most out of a "Photo walk" Photo walks are a great way to get out and get clicking, either by yourself, with a couple of friends, or with a group of people. They can be wonderful for seeing a neighborhood or wild space with new eyes, getting inspired to be more creative with angles and subjects, as well as simply spending time with fun people. Here are a few tips for making sure you get the most out of a photo walk. Pick a spot with lots of interest A photo walk is a perfect excuse to go exploring a new area. However, if you've never been to the scene before, you might be disappointed at the final photos. Base your chosen spot on what you feel like photographing---whether that is buildings, people, busy streets, a festival, nature and so on, and make sure the place you're heading for is filled with what you most want to shoot. It will pay off in a satisfying walk if you research your chosen spot beforehand and know what to expect. Invite anyone, no matter what their skill level is You'll be surprised at what you learn from people who seem to know nothing about photography. Even with a simple camera, they can catch some outstanding photos. So bring Aunt Betty or your 10-year-old nephew or anyone else whose company you might enjoy on a walk and keep an open mind. Don't forget them Be sure to take the important small things, such as an extra memory card (or two), an extra fully charged battery, comfortable shoes and clothing. And remember a notepad and pen for taking down notes about places, times, conditions, the names and information of people you meet and any other information you might want to remember about certain shots. Keep an eye out for danger Apart from watching the sky for rain, you'll want to watch out for other people as well. Smartphones are always a target for thieves but they have become much clearer about the value of digital cameras. Don't make yourself a target by standing for a very long time holding your camera out in front of you. If you're in an area that is really... You are supposed to hold the camera around your wrist or shoulder in case _ . A) it is stolen by a thief B) it gets wet in the rain C) it loses some information D) it falls down on the ground
A
(Question)
Eddie McKay, a once-forgotten pilot, is a subject of great interest to a group of history students in Canada. It all started when Graham Broad, a professor at the University of Western Ontario, found McKay's name in a footnote in a book about university history. McKay was included in a list of university alumni who had served during the First World War, but his name was unfamiliar to Broad, a specialist in military history. Out of curiosity, Broad spent hours at the local archives in a fruitless search for information on McKay. Tired and discouraged, he finally gave up. On his way out, Broad's glance happened to fall on an exhibiting case showing some old newspapers. His eye was drawn to an old picture of a young man in a rugby uniform. As he read the words beside the picture, he experienced a thrilling realization. "After looking for him all day, there he was, staring up at me out of the exhibiting case," said Broad. Excited by the find, Broad asked his students to continue his search. They combed old newspapers and other materials for clues. Gradually, a picture came into view. Captain Alfred Edwin McKay joined the British Royal Flying Corps in 1916. He downed ten enemy planes, outlived his entire squadron as a WWI flyer, spent some time as a flying instructor in England, then returned to the front, where he was eventually shot down over Belgium and killed in December 1917. But there's more to his story. "For a brief time in 1916 he was probably the most famous pilot in the world," says Broad. "He was credited with downing Oswald Boelcke, the most famous German pilot at the time." Yet, in a letter home, McKay refused to take credit, saying that Boelcke had actually crashed into another German plane. McKay's war records were destroyed during a World War II air bombing on London -- an explanation for why he was all but forgotten. But now, thanks to the efforts of Broad and his students, a marker in McKay's memory was placed on the university grounds in November 2007. "I found my eyes filling with tears... What did the students find out about McKay? A) He trained pilots for some time. B) He lived longer than other pilots. C) He died in the Second World War. D) He was downed by the pilot Boelcke.
(Answer)
A
Medical drugs sometimes cause more damage than they cure. One solution to this problem is to put the drugs inside a capsule, protecting them from the body--and the body from them--until they can be released at just the right spot. There are lots of ways to trigger this release, including changing temperature, acidity, and so on. But triggers can come with their own risks--burns, for example. Now, researchers in California have designed what could be a harmless trigger to date: shining near-infrared light (NIR, ) on the drug in the capsule. The idea of using light to liberate the drug in the capsule isn't new. Researchers around the globe have developed polymers and other materials that begin to break down when they absorb either ultraviolet (UV, ) or visible light. But tissues also readily absorb UV and visible light, which means the drug release can be triggered only near the skin, where the light can reach the capsule. NIR light largely passes through tissues, so researchers have tried to use it as a trigger. But few compounds absorb NIR well and go through chemical changes. That changed last year when Adah Almutairi, a chemist at the University of California, San Diego, reported that she and her colleagues had designed a polymer that breaks down when it absorbs NIR light. Their polymer used a commercially available NIR-absorbing group called o-nitrobenzyl (ONB). When they catch the light, ONB groups fall off the polymer, leading to its breakdown. But ONB is only a so-so NIR absorber, and it could be poisonous to cells when it separates from the polymer. So Almutairi and her colleagues reported creating a new material for capsules that's even better.This one consists of a long chain of compounds called cresol groups linked in a polymer. Cresol contains reactive components that make it highly unstable in its polymeric form, a feature Almutairi and her colleagues use to their advantage. After polymerizing the cresols, they cap each reactive component with a light-absorbing compound called Bhc. When the... Why is ONB unsatisfactory? A) It breaks down when it absorbs NIR light. B) It falls off the polymer and triggers drug release. C) It has not come onto the market up till now. D) It is not effective enough and could be poisonous.
D