Our risk of cancer rises dramatically as we age. So it makes sense that the elderly should be routinely screened for new tumors — or doesn't it?

    While such vigilant(警觉的) tracking of cancer is a good thing in general, researchers are increasingly questioning whether all of this testing is necessary for the elderly. With the percentage of people over age 65 expected to nearly double by 2050, it's important to weigh the health benefits of screening against the risks and costs of routine testing.

    In many cases, screening can lead to additional biopsies(活检) and surgeries to remove cancer, which can cause side effects, while the cancers themselves may be slow-growing and may not pose serious health problems in patients' remaining years. But the message that everyone must screen for cancer has become so ingrained(根深蒂固的) that when health care experts recommended that women under 50 and over 74 stop screening for breast cancer, it caused a riotous reaction among doctors, patients and advocacy groups.

    It's hard to uproot deeply held beliefs about cancer screening with scientific data. Certainly, there are people over age 75 who have had cancers detected by routine screening, and gained several extra years of life because of treatment. And clearly, people over age 75 who have other risk factors for cancer, such as a family history or prior personal experience with the disease, should continue to get screened regularly. But for the remainder, the risk of cancer, while increased at the end of life, must be balanced with other factors like remaining life expectancy(预期寿命).

    A recent study suggests that doctors start to make more objective decisions about who will truly benefit from screening—especially considering the explosion of the elderly that will soon swell our population.

    It's not an easy calculation to make, but one that make sense for the whole patient. Dr. Otis Brawley said, “Many doctors are ordering these tests purely to cover themselves. We need to think about the rational(合理的) use of health care and stop talking about the rationing of health care.”

    That means making some difficult decisions with elderly patients, and going against the misguided belief that when it comes to health care, more is always better.

    Nowadays science has made great progress in every aspect and more and more really good inventions have changed our daily lives. However, the U.S. Patent Office has issued over 7.5 million patents (专利), and not all of them are quite so celebrated. Some good, some bad, and some crazy! The following lists some of the most unusual ideas that have come along.

    Snake Leash (皮带)

    In 2002, a patent was issued for a snake-walking leash. There are at least two major problems with this idea. 1) Dog leashes fit securely between the head and shoulders. A snake does not have shoulders; so it might slither (蜿蜒滑行) away. 2) Dogs are OK for public places because they are social animals, and people like them. Snakes are not OK for public places because they are not social, and some people are terrified of them.

    Stadium Helmet

    Americans are known for their love of sports. Unfortunately, good tickets to games are expensive, so some fans have to sit in the backward sections. This invention, patented in 2000, is designed for these fans. Featuring a built-in radio, binoculars (望远镜), a cooling fan, and a helmet for falling litter, this design transforms the stadium experience.

    Bacon Alarm Clock

    When you think about it, waking to the dreadful, blaring noise of an alarm clock is a terrible way to start the day. However, this clock could change that. You simply put a piece of frozen bacon in the alarm clock, set the alarm, and go to sleep. The clock gently wakes you up with the mouth watering smell of bacon the next morning, just like waking up on a Sunday morning to the smell of mom cooking breakfast. Who said there's no time to eat breakfast?

    Toilet Lock

    In 1969, a patent was issued for a really bad idea the toilet seat lock. First of all, fishing for your keys when you have to go seems very unpleasant. Then there is the possibility of losing the key altogether. What about guests? Just think that you would have to ask permission for the bathroom. Of course, there is the ultimate question: Why would you lock it in the first place?

    The search engine Google celebrated on Thursday the 110th birthday of the first Native American woman engineer. Google honored Mary Ross with a special Google Doodle on its homepage.

    Ross was born on August 9, 1908, in the state of Oklahoma. She was the great-granddaughter of John Ross, the longest—serving chief of the Cherokee Nation. Her work is considered important to the early stages of the age of space travel.

    Ross showed special abilities in math and science from an early age. As a student, she developed an interest in aviation, or the practice of flying aircraft. She went on to earn a master's degree in mathematics from Colorado State Teachers College, now called the University of Northern Colorado.

    During World War II, Ross began working for the Lockheed Aircraft Corporation as a mathematician. She earned a special certification in the field from the University of California in1949.Ross was later chosen to join Lockheed's top—secret Skunk Works team that worked on aircraft designs. The name refers to a group that is permitted to work independently on advanced projects. She was the only female engineer among the team's 40 members.

    Early on, she researched defense systems. By the late 1950s, her work centered on satellites and a series of space rockets called Agenda. The rockets were extremely important in the 1960s during the Apollo moon program.

    Ross also helped develop early design ideas for space travel between planets, including flyby space flights to study Venus and Mars. Ross retired from Lockheed in 1973.But she continued to give talks at high schools and colleges to encourage more women and Native Americans to study engineering. She died in 2008, a few months before her 100th birthday.

    Many celebrated Ross' life on social media. Twitter user Aaron Perez, for example, wrote: “Mary Ross was an engineer who pioneered in the field of satellites. I never would have known if it wasn't for the doodle. Women engineers deserve more recognition.”

    If plastic had been invented when the Pilgrims sailed from Plymouth, England, to North America-and their Mayflower had been stocked with bottled water and plastic- wrapped snacks, their plastic waste would likely still be around four centuries later. Atlantic waves and sunlight would have worn all that plastic into tiny bits. And those bits might still be floating around the world's oceans today, waiting to be eaten by some fish or oyster, and finally perhaps by one of us.

    Because plastic wasn't invented until the late 19th century, and its production only really took off around 1950, we have a mere 9.2 billion tons of the stuff to deal with. Of that, more than 6.9 billion tons have become waste. And of that waste, a surprising 6.3 billion tons never made it to a recycling bin-the figure that shocked the scientists who published the numbers in 2017.

    No one knows how much unrecycled plastic waste ends up in the ocean, the earth's last sink. In 2015, Jenna Jam beck a University of Georgia engineering professor, caught everyone's attention with a rough estimate between 5.3 million and 14 million tons of plastic waste each year just come from coastal regions.

    Meanwhile, ocean plastic is estimated to kill millions of marine(海洋的）animals every year. Nearly 700 species, including endangered ones, are known to have been affected by it. Some are harmed visibly, stuck by abandoned things made of plastic. Many more are probably harmed invisibly. Marine species of all sizes, from zooplankton to whales, now eat microplas-tics, the bits smaller than one-fifth of an inch across.

    "This isn't a problem where we don't know what the solution is, "says Ted Siegler, a Vermont resource economist who has spent more than 25 years working with developing nations on garbage." We know how to pick up garbage. Anyone can do it. We know how to deal with it. We know how to recycle. "It's a matter of building the necessary institutions and systems, he says, ideally before the ocean turns into a thin soup of plastic.

    Choose Your One-Day-Tours!

Tour A - Bath &Stonehenge including entrance fees to the ancient Roman bathrooms and Stonehenge -￡37 until 26 March and ￡39 thereafter. Visit the city with over 2,000 years of history and Bath Abbey, the Royal Crescent and the Costume Museum, Stonehenge is one of the world's most famous prehistoric monuments dating back over 5,000 years.

Tour B - Oxford & Stratford including entrance fees to the University St Mary's Church Tower and Anne Hathaway's -￡32 until 12 March and ￡36 thereafter. Oxford: Includes a guided tour of England's oldest university city and colleges. Look over the "city of dreaming spires(尖顶）" from St Mary's Church Tower. Stratford: Includes a guided tour exploring much of the Shakespeare wonder.

Tour C - Windsor Castle &Hampton Court: including entrance fees to Hampton Court Palace -￡34 until 11 March and ￡37 thereafter. Includes a guided tour of Windsor and Hampton Court, Henry VILL's favorite palace. Free time to visit Windsor Castle(entrance fees not included).With 500 years of history, Hampton Court was once the home of four Kings and one Queen. Now this former royal palace is open to the public as a major tourist attraction. Visit the palace and its various historic gardens, which include the famous maze(迷宫) where it is easy to get lost!

Tour D –Cambridge including entrance fees to the Tower of Saint Mary the Great -￡33 until 18 March and ￡37 thereafter. Includes a guided tour of Cambridge, the famous university town, and the gardens of the 18th century.

Are you looking for teen volunteer opportunities for 2024 that provide a rewarding experience that will stay with you for life? Every year thousands of teens choose to volunteer abroad with International Volunteer HQ（IVHQ）-the world's most trusted provider of safe and affordable volunteer programs for teens. 

Service trips for teens are available in more than 50 destinations and there are 17 teen volunteer programs for 16 to 18 year-olds. Some of the best programs in 2024 include Turtle Conservation in Bali, Animal Care in Costa Rica and Childcare in Tanzania. Or, if you're wanting to volunteer with a group of students from your high school, IVHQ can tailor a program for your group too!

• Benefits for volunteers:

• There is no doubt that volunteering as a teenager is a meaningful way to broaden your education and add experiences that will stand out on your college application. 

• Crossing boundaries to work with partners from different parts of the world fosters global understanding. 

• Living in a country different to your own means that you will be involved in a new culture, cuisine, and way of thinking. 

• Guaranteed support:

Chances are your parents will also want to learn more about IVHQ, whether or not they will go abroad with you. Having placed more than 130, 000 volunteers abroad, we're always happy to speak with parents to ensure all their questions are fielded. Through our online safety training, comprehensive information brochures, on-going support from experienced program managers and round-the-clock support from our local teams, IVHQ volunteers are well supported to make the most of the time abroad. 

If you're ready to pack your bags and experience a completely different lifestyle and widen your global perspective, please contact us. IVHQ will be more than happy to offer a service.