【推荐1】Imagine a new smartphone product. It works the same as any other smartphone, but when dropped, those cracks that appear after an annoying fall slowly begin to fade away, and the phone magically repairs itself、A team of researchers led by chemistry professor Takuzo Aida have found a way to create self-repairing plastics that can be used in smartphones, cars and other products. But their new plastics won’t only be used to create unbreakable products, but also help the fight against growing wastes harming the planet.

91% of plastic is non-recyclable and filling Earth with waste. The increasing plastic in landfills is a growing concern due to its negative environmental impact. In 2019 about only9% of plastics were recycled globally, leading Japanese scientists to seek to find plastic that can start its own formation or self-repair.

The self-repairing plastics are made by adding a tiny amount of a specialized substance into ordinary plastic to hold the monomers (单体) together by hydrogen bonds (氢键). When the new plastic is broken down by heat, instead of burning to waste, the hydrogen bonds mix and allow for the formation of special shaped monomers to create a foundation for more monomers to layer on and rebuild itself. The team found that their self-healing plastic was able to automatically repair at room temperature over an hour to regain its durability.

The team’s work suggests great prospects for the future of plastic. “The technique could lead to the development of a made-to-last plastic that does not need to be recycled,” lead professor Aida said at the conference, “and can one day be in products from smartphones to cars and even buildings.”

【推荐3】Wildlife conservation is the practice of protecting plant and animal species and their habitats. As part of the world’s ecosystems, wildlife provides balance and stability to nature’s processes. Wildlife conservation is aimed to ensure the survival of these species and educate people on living sustainably with other species.

The number of people has grown to more than eight billion today, and it continues to rapidly grow. The economic growth endangers the habitats and existence of various types of wildlife around the world, particularly animals and plants that may be displaced for land development, or used for food or other human purposes. This threat is at top of the list and means natural resources are being consumed faster than ever by the billions of people on the planet. The introduction of invasive species from other parts of the world is another threat to wildlife. Other threats include climate change, pollution, fishing and hunting.

International organizations like the World Wildlife Fund, Conservation International, Wildlife Conservation Society and the United Nations work to support global animal and habitat conservation on many different fronts. They work with the government to establish and protect public lands, like national parks and wildlife protection areas. They help write legislation(法规), such as the Endangered Species Act(ESA)of 1973 in the United States, to protect various species. They work with law enforcement to charge those with wildlife crimes. They also promote biodiversity to support the growing human population while preserving existing species and habitats.

National Geographic Explorers, like conservation biologists Camille Coudrat and Titus Adhola, are working to slow the extinction of global species and protect global biodiversity and habitats. Environmental filmmakers and photographers, like Thomas P. Peschak, are essential to conservation efforts as well, documenting and bringing attention to endangered wildlife all over the world.

【推荐2】Think back to your first memory. How old were you at the time? Chances are you can’t remember anything earlier than kindergarten or primary school — nothing about your first words, steps, or solid food other than what your parents have later told you. This phenomenon is called “infantile amnesia”, due to which the majority of adults rarely remember things that happen to them before the age of three.

So why is it that we can’t remember being a baby? The answer lies in the way that our brain’s ability to store memories changes as we grow. At birth, a baby’s brain is only a quarter of its adult size, growing to three-quarters the size of an adult brain by age two. This increase is associated with a growth in the number of brain cells — called neurons (神经元) — and the connections between these cells.

A part of the brain that is particularly important in forming memories is the hippocampus (海马体), says Dr Dhanisha Jhaveri, a researcher at The University of Queensland. This region stores autobiographical memories from specific events in our lives. “In the hippocampus, new neurons are constantly being created. In adulthood, new cells are still being produced, but the rate of production in the hippocampus slows down,” says Dr Jhaveri.

Neuroscientists believe that the rapid rate at which brain cells are being produced in childhood could be the cause of infantile amnesia. Because so many new neurons are being produced and form connections with each other in memory circuits, they might disrupt (扰乱) existing networks of memories that have already formed.

Despite this memory loss, childhood experiences have been found to influence adult behaviour years later, which suggests that traces of these memories could be stored somewhere in the brain that isn’t easy to access.

In research in animals, scientists have found that latent (潜在的) traces of early experiences remain in the brain for a long time, and can later be triggered (触发) by a reminder. It highlights the important influence of early life experiences on mental and emotional well-being later in life.

【推荐3】People who work with octopuses(章鱼)or who spend a lot of time in their company describe the sense that when you look at an octopus, there is something looking back. Given this feeling as a starting point, how do you begin to explore the consciousness(意识)of an animal so unlike ourselves?

Imagining an octopus’s inner life is a hard thing to do from our human standpoint. When you picture the tips of your suckered limbs moving, what do you imagine it feels like? “The octopus’s arms are, in some ways, more like lips or tongues than hands,” says Godfrey-Smith, a professor of history and philosophy of science. “There’s a great deal of sensory information that’s coming in every time the animal does anything. That’s very different from our situation.”

Take a closer look at the octopus’s nervous system, and things get even stranger. The octopus’s arms have more autonomy than our human arms and legs do. Each has its own minibrain, giving it a degree of independence from the animal’s central brain. Our own nervous system, however, is highly centralized, with the brain the center of sensory integration, emotion, movement, behavior and other actions.

The closer you look at the octopus’s body and nervous system, the harder it becomes to grasp—or believe you are grasping—what it might be like to be an octopus. However hard it might be to do, it’s worth trying to understand whether octopuses have consciousness, and what it’s like if they do, says Godfrey-Smith. This is why the octopus is such an interesting case. Octopuses are different enough from us that a lot of our assumptions about them have to be questioned—and even our assumptions about ourselves. “By asking whether octopuses are conscious like us, we might be asking a question that doesn’t make a lot of sense because we don’t fully know what it’s like to be conscious,” says Godfrey-Smith.