One baby born with a defective windpipe now has hope of breathing normally thanks to 3-D printing technology, NPR reported. Garrett Peterson, now 18 months old, was born with tracheomalacia , leaving him unable to breathe. The condition terrified his parents, who turned to specialist Dr. Glenn Green at the University of Michigan for a possible treatment. Along with Scott Hollister, a biomedical engineer who runs the university's 3-D printing lab, Green designed a device that can hold open Garrett's windpipe until it's strong enough to function independently. After taking a CT scan of Garrett's windpipe to make a replica of it, they made the "splint" with a 3-D printer. "It's like a protective shell that goes on the outside of the windpipe, and it allows the windpipe to be tacked to the inside of that shell to open it up directly," Green told NPR. On January 31, Garrett had his surgery. Surgeon Dr. Richard Ohye opened up Garrett's chest and saw that his windpipe had completely collapsed and one of his lungs was completely white -- a condition Ohye had only seen in dead bodies. After eight hours of surgery and careful placement of a splint on either side of Garrett's windpipe, it was time for the big test: What would happen when they let air flow through the windpipe into Garrett's lungs? Though he still remains in the hospital, Garrett has gotten stronger and needs less assistance breathing in the weeks since his surgery. His parents are overjoyed, saying he's starting to act more interactive and alert. As Garrett grows, the splint will expand and eventually dissolve in his body as his own windpipe strengthens enough to work independently. 3-D printing technology has allowed doctors to help patients in ways that they hope will continue to grow. "We're talking about taking something like dust and converting it into body parts," Green said. "And we're able to do things that were never possible before." According to the passage, doctors' attitude toward 3-D printing technology in medical care is _ . A) positive B) negative C) unknown D) indifferent
A
(Question)
Walter Wetzel had met Ryan Lamantia nearly eight years ago in a hospital waiting room. Both were very sick----Ryan with brain cancer, Walter with leukemia . Ryan, who was 3 at the time, began making silly faces at Walter and chatted about going home to change into his Teenage Mutant Ninja Turtles costume. Several days later, Ryan moved to another hospital. Though they saw each other only a handful of times after that, Walter never forgot Ryan. "He inspired me to fight against my cancer," said Walter, now 17, a football player. Then one day, Walter saw a Teenage Mutant Ninja Turtles shirt at a mall, which made him decide to search out Ryan. Back home, Walter typed in "Ryan Lake in the Hills brain cancer" on his computer, and a link to a Facebook page for Ryan came up. But, the news was shocking. Ryan had died on Sept. 8, 2005. He was 6. The Facebook page was for the Ryan Lamantia Foundation, a non-profit organization that Ryan's family formed after his death to raise money for brain cancer research. Walter left this message right away: ."Ryan is my hero. My trips to the hospital were always horrible, until the day I met Ryan." Ryan's mom's eyes were filled with tears as she read Waiter's message. "We always knew Ryan was special, but to hear it from somebody else, it really means the world to us," Lamantia said. Walter wasn't the only person who was greatly impressed with Ryan. "He was a little superhero," said Wendy Stellpflug, a nurse at Children' s Memorial Hospital. "Ryan always kept his spirits high, even after he suffered hearing loss and experienced 14 operations." "Ryan didn' t let his illness stop him. He always had a smile on his face," said Dr. Stewart Goldman, the doctor who treated Ryan. Walter and his family have been in touch with the Lamantias for the past few weeks. And last week, they met for the first time since Ryan's death. The families told stories of being affected by cancer so young and Walter expressed his hope to volunteer with Ryan' s foundation. After reading Waiter's message online, Ryan' s mom felt _ . A) proud of her son B) grateful for his help C) happy about his recovery D) sad again at her son' s death
(Answer)
A
For many years, scientists have wondered how Chrysopelea paradisi, known as the "flying" snakes, can stay afloat as they leap from one tree to another, sometimes covering a distance of as long as 79 feet. Now a new study has explained that it may be all to do with the way they move. The report was published by Virginia Tech scientist, Jake Soeha who has been studying the flying snakes for a number of years. He began his research by first focusing on its launch technique. He discovered that the snakes first make themselves completely flat and then move side to side; they glide rapidly at a speed of between 26-33 feet per second, before leaping off. Once they take off, their bodies actually tilt at about a 25-degree angle to the airflow created by their flight. When they first leap, the snakes start to drop altitude to pick up speed. With the front of their bodies held stiff, they start a strange air-gliding dance, by moving from side to side. This turns their entire body into one big wing, allowing them to glide across long distances. The findings are not only exciting because they solve the puzzle of how the snakes are able to fly, but also because the same principles could be used to build small flying instruments. The flying snakes that are native to South and South East Asia spend most of their lives in trees in the lowland tropical forests. They grow between 2-3 feet long and are about as wide as a human finger. As would be expected, the smaller and lighter ones are more able to "glide" for longer distances than the bigger and heavier ones. They are not the only wingless animals that can fly -- there are flying frogs that use similar gliding techniques to make their way across forests. The best title for the passage is_. A) New Flying Animals B) Small Flying Instruments C) The New Findings D) Flying Snakes
D