1 . Is It Worth Buying Organic Food?

Organic food, grown without artificial chemicals, is increasingly popular nowadays. Consumers have been willing to pay up to twice as much for goods with organic labels (标签). However, if you think paying a little more for organic food gets you a more nutritious (有营养的) and safer product, you might want to save your money. A study led by researchers at Stanford University says that organic products aren’t necessarily more nutritious, and they’re no less likely to suffer from disease-causing bacteria, either.

The latest results, published in the Annuals of Internal Medicine, suggest that buyers may be wasting their money. “We did not find strong evidence that organic food is more nutritious or healthier,” says Dr. Crystal Smith-Spangler from Stanford. “So consumers shouldn’t assume that one type of food has a lower risk or is safer.”

For their new study, Smith-Spangler and her colleagues conducted a review of two categories of research, including 17 studies that compared health outcomes between consumers of organic against traditional food products, and 223 studies that analyzed the nutritional content of the foods, including key vitamins, minerals and fats.

While the researchers found little difference in nutritional content, they did find that organic fruit and vegetables were 20% less likely to have chemicals remaining on the surfaces. Neither organic nor traditional foods showed levels of chemicals high enough to go beyond food safety standards. And both organic and traditional meats, such as chicken and pork, were equally likely to be harmed by bacteria at very low rates. The researchers did find that organic milk and chicken contained higher levels of omega-3 fatty acids, a healthy fat also found in fish that can reduce the risk of heart disease. However, these nutritional differences were too small, and the researchers were unwilling to make much of them until further studies confirm the trends.

Organic food is produced with fewer chemicals and more natural-growing practices, but that doesn’t always translate into a more nutritious or healthier product. The U.S. Department of Agriculture (USDA) states that “Whether you buy organic or not, finding the freshest foods available may have the biggest effect on taste.” Fresh food is at least as good as anything marketed as organic.

2 . Three months after Hurricane Katrina in 2005, Rebecca Sell, then 24, a photojournalist for Fredericksburg photographed a New Orleans couple worriedly examining water-spotted photo albums. As she took the photo, something within her clicked. “I told them I could take the ruined pictures, copy them and give them digitally restored photos,” she recalls. Although a bit sceptical, the couple agreed. Rebecca took their photos home, restored them and took them to the couple at their temporary home. “It felt so good to be able to do that for them,” says Rebecca.

When her editor, Dave Ellis, saw the photo of the couple, he suggested they go back and restore damaged photos for even more people. So in January 2006, with paid time off from the newspaper, the two set up a shop in Pass Christian. After posting a notice in the community newsletter, Rebecca and Dave received 500 photos in four days. For each, the pair took a new digital picture, then used high-tech software to erase water spots and restore colors. It just so happened that a popular website linked to Dave’s blog about the experience, and soon Operation Photo Rescue, as it came to be known, had emails from hundreds of volunteers, including photographers and restoration experts, eager to help.

Though the digital restoration is a painstaking process, mending irreplaceable family pictures means the world to victims like Emily Lancaster, 71, who took out piles of ruined photo albums after Katrina, never thinking the mess could be saved. But she just couldn’t bear to part with a few treasured pictures, including a portrait of her father, who had passed away, and a photo of her husband as a boy. Then she heard about Operation Photo Rescue. “I didn’t have a whole lot of hope they could fix them, but they did,” Emily says. “Almost every day I think about all the pictures I’ve lost. I’m so happy to have these two.”

In the five years since Katrina, Operation Photo Rescue has collected thousands of pictures ruined by floods, hurricanes and tornadoes. Volunteers make “copy runs” to disaster areas across the country to gather damaged photos from survivors; operating costs are covered by donations. “It’s great to be able to give people some of their history back,” says Rebecca. “One person told me that thanks to us, her grandmother got to see her photos again before she passed away. Moments like that remind me why I do this.”

3 . Delivering life-saving drugs directly to the brain in a safe and effective way is a challenge for medical providers. One key reason: the blood-brain barrier, which protects the brain from tissue-specific drug delivery. Methods such as an injection or a pill aren’t as precise or immediate as doctors might prefer, and ensuring delivery right to the brain often requires invasive, risky techniques.

A team of engineers from Washington University in St. Louis has developed a new nano-particle generation-delivery method that could someday vastly improve drug delivery to the brain, making it as simple as a sniff.

“This would be a nano-particle nasal spray, and the delivery system could allow medicine to reach the brain within 30 minutes to one hour,” said Ramesh Raliya, research scientist at the School of Engineering & Applied Science.

“The blood-brain barrier protects the brain from foreign substances in the blood that may injure the brain,” Raliya said. “ But when we need to deliver something there, getting through that barrier is difficult and invasive. Our non-invasive technique can deliver drugs via nano-particles, so there’s less risk and better response times.”

The novel approach is based on aerosol science and engineering principles that allow the generation of mono-disperse nano-particles, which can deposit on upper regions of the nasal cavity via spread. The nano-particles were tagged with markers, allowing the researchers to track their movement.

Next, researchers exposed locusts’ antenna to the aerosol, and observed the nano-particles travel from the antennas up through the olfactory nerve, which is used to sense the smell. Due to their tiny size, the nano-particles passed through the brain-blood barrier, reaching the brain and spreading all over it in a matter of minutes.

The team tested the concept in locusts because the blood-brain barriers in the insects and humans have similarities. “The shortest and possibly the easiest path to the brain is through your nose,” said Barani Raman, associate professor of biomedical engineering. “Your nose, the olfactory bulb and then olfactory cortex: two steps and you’ve reached the cortex.”

To determine whether or not the foreign nano-particles disrupted normal brain function, Saha examined the physiology response of olfactory neurons in the locusts before and after the nano-particle delivery and found no noticeable change in the electro-physiological responses was detected.

This is only a beginning of a set of studies that can be performed to make nano-particle-based drug delivery approaches more principled, Raman said. The next phase of research involves fusing the gold nano-particles with various medicines, and using ultrasound to target a more precise dose to specific areas of the brain, which would be especially beneficial in brain-tumor cases.

4 . The student arrived early, sat front and center, and stood out in my classroom in more ways than one. I’d say that he was about 40 years older than his classmates in my undergraduate communications class. He eagerly jumped into class discussions, with his humor and wisdom of experience. And he was always respectful of the other students’ perspectives, as if each of them were a teacher. Jerry Valencia walked in with a smile—and he left with one too.

“These students gave me the confidence that I didn’t need to feel bad about my age,” Valencia says.

One day, I spotted Valencia on campus. He said he would have to stop taking classes that semester and reapply for next year. By then, he hoped to have earned enough money and have his student-loan papers in order. He asked seriously whether he could still sit in on my communications class.

Sure, I said. But he wouldn’t get any credit.

No problem, he said.

Soon there he was again, back at his old desk, jumping into our discussions on how to find and tell stories in Los Angeles—a 63-year-old man with as much energy and curiosity as any of the youngsters in class.

A lot of Valencia’s classmates apparently knew he couldn’t afford that semester’s tuition but was still doing the homework. “Here he is, willingly taking a class for the delight of it and benefit of learning,”says Jessica Espinosa, a 25-year-old junior. Afterward, I overheard Valencia wanted to stay in school until he earned a master’s degree, but it had taken him 12 years to finish community college, so he had a long way to go.

There is something splendidly unreasonable about Valencia’s determination to get a four-year degree and then a master’s. At his current pace, he’ll be 90 when he finally hangs all that paper on the wall. But that doesn’t seem especially relevant. He’s found all the youthful energy and academic opportunity stimulating. Valencia’s grade in my class this semester will not show up on his transcripts(成绩单). But I’m giving him an A—and in the most important ways, it counts.

6 . When I was 7 and Stevie was 6, our parents taught us how to play chess and other games. Playing games was our life back then. Stevie and I were very competitive in everything.

We got older and better so our games were more intense, but also more exciting. The strange thing is that I enjoyed the games vastly and was happy for my brother when he won. But afterwards, I felt my well-being threatened, and then my confidence suffered.

When I was 10 years old I wanted to be successful at my talents. One day, a light came on in my head. I had to find something Stevie couldn’t do. It would have to be unique in every way. Before long, I got Jimmy Nelson’s record on “How to Become a Ventriloquist (腹语师)” and I practiced faithfully every day. After summer vacation, I did my first show for my class. The response was favorable. I performed for family get-togethers and did shows on a number of occasions to practice my new skill.

It isn’t easy learning ventriloquism. The difficult part was developing the voice, because at first, it was soft and hard to hear. I memorized the routines and performed more. With time, I got better responses. The loud laughter was nonstop, in addition to the applause.

Four years later, my mother purchased professional ventriloquial figure, which I named Freddie O’Sullivan. He was lifelike, with moving eyes, moving eyebrows, and could stick out his tongue. Treating Freddie like a real person enhanced my performance.

In college, Freddie was well known. He would tell people that he was the only guy that could sleep in the girl’s dormitory. Over the years, I won many talent awards.

One time, an elderly man looked at Freddie attentively and asked him where he got his trousers. The audience nearby had tears in their eyes. I didn’t know what was going on until I was told later the gentleman hadn’t spoken for 20 years.

Thanks to my brother, I created a lifetime with Freddie.

Horses are picky eaters

Horses have an even better sense of smell than humans do. When horses raise their noses and open their nostrils (鼻孔), their nervous system allows them to sense smells we can’t sense. This might explain why they refuse dirty water and carefully move around meadows, eating only the tastiest grasses, experts say.

Whale says thanks

In 2018, a whale expert spotted a humpback whale trapped in a fishing net and spent an hour freeing it. Afterward, in an hour-long display of thanks, the whale swam near their boat and leaped into the air about 40 times.

Pandas like to be naughty

Is there anything more lovely than a baby panda, except maybe a human baby? In fact, baby pandas sometimes behave like human babies. They sleep in the same positions and value their thumbs. Pandas are shy by nature for its shy behaviors such as covering its face with a paw or ducking its head when confronted by a stranger.

A cat honors its owner

Paper towels, and a plastic cup are just a few of the gifts that Toldo, a devoted three-year-old gray-and-white cat, has placed on his former owner Iozzelli Renzo’s grave every day since the man died in September 2018. Renzo adopted Toldo from a shelter when the cat was three months old, and the two formed an inseparable bond. After Renzo passed away, Toldo followed the coffin to the cemetery, and now “stands guard” the grave for hours at a time.

8 . The Amazon rainforest is as undisturbed a place as most people can imagine, but even there, the effects of a changing climate are playing out. Now, research suggests that many of the region’s most sensitive bird species are starting to evolve in response to warming.

Birds are often considered sentinel (哨兵) species — meaning that they indicate the overall health of an ecosystem — so scientists are particularly interested in how they’re responding to climate change. In general, the news has not been good. For instance, a 2019 report by the National Audubon Society found that more than two-thirds of North America’s bird species will be in danger of extinction by 2100 if warming trends continue on their current course.

For the new study, researchers collected the biggest database so far on the Amazon’s resident birds, representing 77 non-migratory species and lasting the 40 years from 1979 to 2019. During the study period, the average temperature in the region rose, while the amount of rainfall declined, making for a hotter, dryer climate overall. According to the report on November 12 in the journal Science Advances, 36 species have lost substantial weight, as much as 2 percent of their body weight per decade since 1980. Meanwhile, all the species showed some decrease in average body mass, while a third grew longer wings.

Because of the study’s long time series and large sample sizes, the authors were able to show the morphological (形态学的) effects of climate change on resident birds. However, the researchers themselves are unsure and wonder what advantage the wing length changes give the birds, but suppose smaller birds may have an easier time keeping cool. In general, smaller animals have a larger rate of surface area to body size, so they dissipate more heat faster than a bigger animal. Less available food, such as fruit or insects, in dryer weather might lead to smaller body size.