1 . In the race to document the species on Earth before they go extinct, researchers and citizen scientists have collected billions of records. Today, most records of biodiversity are often in the form of photos, videos, and other digital records. Though they are useful for detecting shifts in the number and variety of species in an area, a new Stanford study has found that this type of record is not perfect.

“With the rise of technology it is easy for people to make observations of different species with the aid of a mobile application,” said Barnabas Daru, who is lead author of the study and assistant professor of biology in the Stanford School of Humanities and Sciences. “These observations now outnumber the primary data that comes from physical specimens (标本), and since we are increasingly using observational data to investigate how species are responding to global change, I wanted to know: Are they usable?”

Using a global dataset of 1.9 billion records of plants, insects, birds, and animals, Daru and his team tested how well these data represent actual global biodiversity patterns.

“We were particularly interested in exploring the aspects of sampling that tend to bias (使有偏差) data, like the greater likelihood of a citizen scientist to take a picture of a flowering plant instead of the grass right next to it,” said Daru.

Their study revealed that the large number of observation-only records did not lead to better global coverage. Moreover, these data are biased and favor certain regions, time periods, and species. This makes sense because the people who get observational biodiversity data on mobile devices are often citizen scientists recording their encounters with species in areas nearby. These data are also biased toward certain species with attractive or eye-catching features.

What can we do with the imperfect datasets of biodiversity?

“Quite a lot,” Daru explained. “Biodiversity apps can use our study results to inform users of oversampled areas and lead them to places — and even species — that are not well-sampled. To improve the quality of observational data, biodiversity apps can also encourage users to have an expert confirm the identification of their uploaded image.”

2 . Is comprehension the same whether a person reads a text onscreen or on paper? And are listening to and viewing content as effective as reading the written word when covering the same material? The answers to both questions are often “no”. The reasons relate to a variety of factors, including reduced concentration, an entertainment mindset (心态) and a tendency to multitask while consuming digital content.

When reading texts of several hundred words or more, learning is generally more successful when it’s on paper than onscreen. A large amount of research confirms this finding. The benefits of print reading particularly shine through when experimenters move from posing simple tasks — like identifying the main idea in a reading passage — to ones that require mental abstraction — such as drawing inferences from a text.

The differences between print and digital reading results are partly related to paper’s physical properties. With paper, there is a literal laying on of hands, along with the visual geography of distinct pages. People often link their memory of what they’ve read to how far into the book it was or where it was on the page.

But equally important is the mental aspect. Reading researchers have proposed a theory called “shallowing hypothesis (假说)”. According to this theory, people approach digital texts with a mindset suited to social media, which are often not so serious, and devote less mental effort than when they are reading print.

Audio (音频) and video can feel more engaging than text, and so university teachers increasingly turn to these technologies — say, assigning an online talk instead of an article by the same person. However, psychologists have demonstrated that when adults read news stories, they remember more of the content than if they listen to or view identical pieces.

Digital texts, audio and video all have educational roles, especially when providing resources not available in print. However, for maximizing learning where mental focus and reflection are called for, educators shouldn’t assume all media are the same, even when they contain identical words.

3 . HABITAT RESTORATION TEAM

Help restore and protect Marin's natural areas from the Marin Headlands to Bolinas Ridge. We'll explore beautiful park sites while conducting invasive (侵入的) plant removal, winter planting, and seed collection. Habitat Restoration Team volunteers play a vital role in restoring sensitive resources and protecting endangered species across the ridges and valleys.

Groups of five or more require special arrangements and must be confirmed in advance. Please review the List of Available Projects and fill out the Group Project Request Form.

Volunteers aged 10 and over are welcome. Read our Youth Policy Guidelines for youth under the age of 15.

Bring your completed Volunteer Agreement Form. Volunteers under the age of 18 must have the parent/guardian approval section signed.

We'll be working rain or shine. Wear clothes that can get dirty. Bring layers for changing weather and a raincoat if necessary.

Bring a personal water bottle, sunscreen, and lunch.

No experience necessary. Training and tools will be provided. Fulfills (满足) community service requirements.

4 . “I am not crazy,” says Dr. William Farber, shortly after performing acupuncture (针灸) on a rabbit. “I am ahead of my time.” If he seems a little defensive, it might be because even some of his coworkers occasionally laugh at his unusual methods. But Farber is certain he’ll have the last laugh. He’s one of a small but growing number of American veterinarians (兽医) now practicing “holistic” medicine-combining traditional Western treatments with acupuncture, chiropractic (按摩疗法) and herbal medicine.

Farber, a graduate of Colorado State University, started out as a more conventional veterinarian. He became interested in alternative treatments 20 years ago when he suffered from terrible back pain. He tried muscle-relaxing drugs but found little relief. Then he tried acupuncture, an ancient Chinese practice, and was amazed that he improved after two or three treatments. What worked on a veterinarian seemed likely to work on his patients. So, after studying the techniques for a couple of years, he began offering them to pets.

Leigh Tindale’s dog Charlie had a serious heart condition. After Charlie had a heart attack, Tindale says, she was prepared to put him to sleep, but Farber’s treatments eased her dog’s suffering so much that she was able to keep him alive for an additional five months. And Priscilla Dewing reports that her horse, Nappy, “moves more easily and rides more comfortably” after a chiropractic adjustment.

Farber is certain that the holistic approach will grow more popular with time, and if the past is any indication, he may be right: Since 1982, membership in the American Holistic Veterinary Medical Association has grown from 30 to over 700. “Sometimes it surprises me that it works so well,” he says. “I will do anything to help an animal. That’s my job.”

5 . Do you ever get to the train station and realize you forgot to bring something to read? Yes, we all have our phones, but many of us still like to go old school and read something printed.

Well, there’s a kiosk (小亭) for that. In the San Francisco Bay Area, at least.

“You enter the fare gates (检票口) and you’ll see a kiosk that is lit up and it tells you can get a one-minute, a three-minute, or a five-minute story,” says Alicia Trost, the chief communications officer for the San Francisco Bay Area Rapid Transit — known as BART. “You choose which length you want and it gives you a receipt-like short story.”

It’s that simple. Riders have printed nearly 20,000 short stories and poems since the program was launched last March. Some are classic short stories, and some are new original works.

Trost also wants to introduce local writers to local riders. “We wanted to do something where we do a call to artists in the Bay Area to submit stories for a contest,” Trost says. “And as of right now, we’ve received about 120 submissions. The winning stories would go into our kiosk and then you would be a published artist.”

Ridership on transit (交通) systems across the country has been down the past half century, so could short stories save transit?

Trost thinks so.

“At the end of the day all transit agencies right now are doing everything they can to improve the rider experience. So I absolutely think we will get more riders just because of short stories,” she says.

And you’ll never be without something to read.

8 . In the past few years, online learning has become a significant part of the university and college experience.     1     But are all online courses created equal? How can you be sure that digital learning is right for you?     2    

We interviewed students and professors to get their advice about online courses, The most obvious advantage of online learning is that you can study anywhere and anytime.     3     “I think a point that many people lose sight of is how easy it can be to fall behind schedule,” says graduate student Amanda Bindman. Before choosing to study online, consider whether you’re a self-motivated learner and if the material seems interesting enough to keep you going.

The tip that comes up most often is simple: build online courses into your weekly schedule, just like what you would do with in person courses.     4     He noted that his online students usually end up with lower grades. It is so easy to let an online course slide, but your grades will suffer as a result. Be sure to schedule set times to watch your lectures, read materials and contribute to online discussion boards.

    5     A social connection is often a big part of learning. There are things you can do to ease this problem. Jessica Pink, an undergraduate student, suggests taking online courses with a friend, so you can motivate each other to stay on track. You can also find students on the class discussion board to organize a study group, or schedule in-person meeting s with your professor to discuss course concepts.

9 . When was the last time you used a telephone box? I mean to make an actual phone call — not to shelter from the rain. Ages ago, right? The last time I used a phone box for its intended purpose was…2006. I was conducting auditions (试演) for my play in my tiny old shared house in London. Hoping to impress some talented actors to come and work for me for nothing, I spread some throws over the sofas and lit candles to make it seem a bit more ”young professional”.

As I rushed outdoors to empty the wastepaper baskets, the door swung shut behind me. Suddenly I was locked outside. My mobile phone was inside, but luckily there was a telephone box across the street. So, I called Directory Assistance, got put through to our landlady’s managing agent, and had a spare key sent to me with just enough time to get back in before the actors arrived.

As it has been many years since I last used one, I should hardly be surprised that then are no longer any public telephones near my house. The last one standing has just been turn into a “mini community library”: any passer-by can “borrow” a book from its shelves return it later, or replace it with another title from their own collection.

For a few months after the “library” opened, I didn’t bother taking a look, as I had assumed that it would be stuffed full of cheese love stories. Then I noticed fork conducting spring cleans dropping boxes of voluminous books on various subjects there. And these books were free. This unbeatable price-point encouraged me to experiment with dozens of titles that I would never normally consider buying. And I’ve discovered some great books!

If I ever get trapped outside my house again, my local telephone box will, sadly no longer be able to connect me with my keys. But it can certainly keep me entertained while I wait for my wife to rescue me.

10 . Tom Sawyer Play Is an Adventure

A 35-minute hand-clapping, foot-stomping musical version of a Mark Twain favorite returns with this Tall Stacks festival.

“Tom Sawyer: A River Adventure” has all the good stuff, including the fence painting, the graveyard, the island and the cave. It is adapted by Joe McDonough, with music by David Kisor. That’s the local stage writing team that creates many of the Children’s Theatre of Cincinnati’s original musicals, along with the holiday family musicals at Ensemble Theatre.

This year Nathan Turner of Burlington is Tom Sawyer, and Robbie McMath of Fort Mitchell is Huck Finn.

Tumer, a 10th-grader at School for Creative and Performing Arts, is a familiar presence on Cincinnati’s stages. He is a star act or of Children’s Theatre, having played leading roles in “The Legend of Sleepy Hollow” and “The Wizard of Oz,” and is fresh from Jersey Production “Ragtime”.

McMath is a junior at Beechwood High School. He was in the cast of “Tom Sawyer” when it was first performed and is a Children’s Theatre regular, with five shows to his credit. This summer he attended Kentucky’s Governor’s School for the Arts in Musical Theatre.

Note to teachers: Children’s Theatre has a study guide demonstrating how math and science can be taught through “Tom Sawyer.” For downloadable lessons, visit the official website of Children’s Theatre.