1 . The environment has never been more in need of a helping hand from us. Schools, in particular, are in a great position to educate future generations and make sure that good environmental habits are learned and adopted from an early age. So, ranging from energy efficiency to recycling, here are our tips to make your school more eco-friendly and sustainable.

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Sending waste to landfill to slowly rot away isn’t the best use of the world’s resources. Plus, the space available for landfill is rapidly running out. Instead, boost recycling by providing appropriate and appealing facilities with clear signage (标识).     2    .

☆Turn off the lights and fit energy-efficient light bulbs

Saving energy used for lighting is one of the easiest things that we can do.     3    . Turn off lights when they’re not needed. Signage asking people to turn off the lights can act as a useful reminder.

☆Go paperless

    4    , with paper now being seen as outdated in many cases. This is good news for the environment, but it sometimes needs people to change how they do things. Look into options for creating and using fewer paper-based administration systems at school and think twice before printing or photocopying all those A4 pages, for example.

☆Reject plastic water bottles

Recent television programs and campaigns have raised the issue of waste plastic towards the top of the environmental agenda. In some ways, this isn’t surprising because, again, it is relatively easy for everyone to make a difference to the environment with minimal effort.     5    . Just stop buying brand-new water bottles that are used once and then recycled, and reuse existing bottles and containers instead.

2 . Melissa Sevigny, a science journalist for Arizona Public Radio, recounts the details of the 1938 river journey of Elzada Clover and Lois Jotter, who, along with their guide, Norm Nevills, and a few other crew members, traveled down the Colorado River with the goal of cataloging (登记) undiscovered plants in the area. The Colorado River was known as the most dangerous river in the world. But for Clover and Jotter, it held-a great appeal: no one had surveyed the Grand Canyon’s plants, and they were determined to be the first.

As women scientists, Clover and Jotter faced scrutiny (监督) even before their trip began. They started in Green River, Utah, and then traveled through Cataract Canyon, Glen Canyon, and the Grand Canyon before ending at Lake Mead. For Clover, the trip fit perfectly with her dream of cataloging all the Southwest’s cacti (a kind of plant), but, more than that, it was a chance to make her mark on the field of botany. As they made their way down the river, they continued to face challenges, including navigating intense rapids, losing one of their three boats, and dealing with aggressive reporters and inaccurate and imaginary news reports. When Clover and Jotter finally reached the entrance of the Grand Canyon, they felt apprehensive, but they decided they had no choice now but to brave the wild river.

Drawing information from the crew’s letters and journals, Sevigny brings us directly into the boats and introduces us to many of the plants that Clover and Jotter surveyed and collected. The author also includes a map of the route and photographic images of the crew at different points along the way. Woven (编织) throughout the narrative of Clover and Jotter is the early history of travel on the Colorado River as well as how Indigenous peoples, Europeans, and the Park Service have shaped the eco logy of the river over time.

As the author notes, women in science still face challenges and barriers; Sevigny hopes that recalling the past will lead to a fairer future.

3 . On Inaccessible Island, you hear the sound of the Inaccessible Island rails (秧鸡) everywhere. The small flightless birds move around, feeding on worms and berries. During a trip in 2011, it took days for Stervander, then a doctoral student, to spot one. “Even then, you see something little and dark, running for a second, and that’s about it,” he says. Catching one, though, proved easy. When scientists played a recording of the bird’s call, a male and female ran into the net a few minutes later.

Inaccessible Island rails live only on Inaccessible Island. “No one knew the history,” says Stervander, now a research fellow at the University of Oregon. He aimed to answer the question about these birds: How did they get to Inaccessible Island to begin with?

The first scientist to describe the rail was Percy Lowe. He thought the bird was from Africa and had always been flightless. In his view, it had arrived at the island by walking over land bridges. But now the science of plate tectonics (板块构造论) suggests that’s not the case. In a recent paper, Stervander and his colleagues give evidence for a different version.

After studying the genome (基因组) of the rails, scientists found the Inaccessible Island rail’s closest relative — the crake in Uruguay. Both birds are related to the black rail in America. The finding suggests the ancestors of these birds could fly. That means Inaccessible Island rails flew to their present home, and like many birds living on islands with no predators (捕食者), they gradually lost the ability to fly. Flying takes energy, so if there’s no reason to fly, it’s more practical not to.

On this island, there’s a growing population of rails, but they’re fragile. Should a predator reach the island, it could make quick work of the birds. People on nearby islands are careful to avoid introducing any predators to Inaccessible Island, and the risk is low, given how hard it is to get there. For now, the rails live peacefully in a place where few humans are eager to go.

4 . We love our pets. In fact, for most people they are more than me re pets and become more like family members. It is likely then that their owners, at some point, are going to want photographs of their furry friends. However, pet photography presents its own special problems.     1     If you’re thinking of trying pet photography, here are a few pointers to get you started.

Find out about your subject’s personality and habits. Where does it nod off if the sun is out? What is its favourite toy?     2     It’s also worth spending a little time getting to know the animal yourself. Cats, dogs, horses, they all have personality, and you need to ensure they are comfortable being around you, and you around them.

    3     If the pet is comfortable with you, and if it isn’t too nervous, fill the frame with the pet’s face. Get the eyes nice and sharp. Just like humans, this is a natural point of focus, although focusing on the nose or mouth of a dog or cat can also make for an interesting image in its own right.

See the world from pets’ perspective. If you photograph a pet while you’re standing up, all you’re going to see is the top of their head and their backs, not what you want for a portrait. Get down to their eye level. Try pre-focusing your camera and just holding it at ground level so you can look up at the pet.     4    .

Bring a flash with the owner’s permission. While greeting or playing with a new pet, fire a couple of test flashes away from them to see their reaction. In daylight particularly, they never seem to mind the flash at all.     5    .

5 . Globally, about 192.1 million animals are used annually for experimental purposes. Iran has conducted animal-based research dating back to the time of Ibn Sina. Although, like many countries, Iran regulates the use and treatment of laboratory animals, it lacks sufficient enforcement. To ensure ethical treatment of research animals, Iran needs better data about their use, and institutions and individuals need to take responsibility for their care.

Iran’s Ministry of Health, which oversees animal testing, requires all animals are treated according to international ethical standards. However, some institutions that produce or use animals provide substandard treatment, disregarding the ministry’s guidelines. To facilitate better enforcement of established regulations, Iran needs clear, accurate and reliable information about the quantity of animals used in research. All Iranian research institutions that use animals should be required to collect and report annual data on the number of animals they use, the conditions in which the animals are kept, and the animals’ research purpose. Such data would allow Iran to track each institution’s adherence (遵守) to the “3Rs”of animal research: Replacing animal-based experiments with alternative strategies, reducing the number of animals used, and refining techniques to minimize the pain and discomfort research animals experience.

In addition to government enforcement, individual institutions should prioritize the replacement, reduction, and refinement of animal use. Iran’s medical schools and research institutions should establish an accessible database with comprehensive experimental details to prevent excessive animal studies. Ethics committees shouldn’t approve experiments that use more animals than necessary or methods that require animals when alternative methods are available. In some cases, technical sampling (using a small sample size) can replace experimental sampling (using a relatively large sample size).

Individuals should also take an active role. All researchers must be trained to adhere to ethical principles and understand unnecessary pain or discomfort in animals could affect the interpretation of data.

Maintaining international ethical standards for animal treatment is vital for Iran to establish its global standing in the field of medical sciences. Iran’s government, institutions, individual scientists, and public can work together to ensure ethical animal research.

6 . Evolution (进化) can perform extraordinary makeovers; today’s airborne songbirds evolved from the wingless, earthbound dinosaurs that wandered millions of years ago. But some organisms seem to be unchanged — in other words, escape natural selection. The coelacanth, a modern-day fish, is nearly identical to its 410-million-year-old fossils.

Scientists have long wondered how these species do so. It has been assumed that natural selection keeps some species unchanged by selecting for moderate or average qualities (stabilizing selection) rather than selecting for more extreme qualities that would cause a species to change (directional selection).

But a study published in the National Academy of Sciences USA contradicts this idea, showing that evolution constantly favors different qualities in seemingly unchanging animals to improve short-term survival. In the long term, though, “all that evolution cancels out and leads to no change,” says the study’s lead author, James Stroud.

Stroud and his colleagues studied for lizard (蜥蜴) specios; all relatively unchanged for 20 million years. The researchers caught members of these populations every six months for three years. They measured each lizard’s head size, leg length, mass and height, as well as the size of its sticky toes (脚趾头), noting which individuals survived. Stroud expected to observe stabılızıng selection at work preserving moderate qualities. Instead he saw clearer evidence of directional selection: some lizards with unique characteristics, such as stickier toes, survived better.

“The study offers a good explanation for why we see what we think is stabiliring selection,” says Tadashi Fukami, an ecologist studying evolution at Stanford University. Many new qualities are evolving in the short term, but they don’t provide a crucial advantage over the long term. In other words, species staying unchanged may simply have found the best possible combination of qualities for lasting success in their environment. So what happens when the lizards’ environment changes more dramatically? To help answer this bigger question, Stroud is still making trips to visit the lizards.

8 . Are worms the heroes we didn’t know we needed? Silent, slimy and wriggling (扭动), you might think that worms are good for nothing except bait (诱饵) on the end of a fishing pole.     1    

The British naturalist Charles Darwin said that no other animal has “played such an important part in the history of the world as these lowly organised creatures”. They have lived on Earth for 600 million years and have even survived five mass extinctions.     2    

Earthworms literally move the earth, and this is why farmers love them. As they travel, they aerate (使透气) the soil by loosening, mixing and oxygenating it.     3     They are effectively a small but very efficient plough (犁). But it’s not just earthworms that deserve praise.

In 2022, a group of scientists at the Margarita Salas Centre for Biological Research isolated enzymes (酶) found in wax worm saliva (唾液) which are plastic-eating.     4     It’s hoped that by producing these enzymes on an industry-level scale, we will have a more environmentally friendly way to reduce plastic pollution.

    5     Bloodworms are small sea creatures which press themselves into the mud of the ocean floor. Scientists at the University of California, Santa Barbara have been studying their jaws, which are made up of 10% copper proteins (铜蛋白) and are so strong that they last the worm’s entire five-year lifespan. Because of this research, engineers may start using the jaws as inspiration for the design and manufacture of materials like concrete.

So, next time you see a worm, show it a little respect. They really are changing the world!