【推荐1】We like to think that the human mind is special. One sign of our superiority is self-awareness, which is generally seen as the peak of consciousness. Only a select group of species has passed the test of being able to recognise themselves in a mirror. Most, including elephants, apes and dolphins, are smart. But now a little fish, the cleaner wrasse has become the first fish ever to pass the mirror test——a classic experiment used to judge self-awareness in animals. What are we to make of this?

Admittedly^ the mirror test is a questionable way of probing （探究）the minds of other animals. But the finding does fit with a new idea that the ability to recognise oneself is more related to an animal’s   lifestyle than to its brain size. Self-awareness is likely to occur in creatures whose survival is dependent on reading the minds of others. In fact, by this way of thinking, it is nothing more than an accidental by-product of evolution^ a simulation （模拟）created by the brain, or even just a hall of mirrors giving the illusion of complexity.

The cleaner wrasse lives on coral reefs and provides a service by biting parasites （寄 生虫）off the scales of bigger fish gently, a delicate relationship that may require insight into the minds of its clients. Such “theory of mind” has long been seen as another cornerstone of human mental superiority. The possibility that fish possess it is not, however, the only threat to our human exceptionalism （例外）.It may not be long before computers give us a run for our money , too.

Researchers have created a set of tests to look for theory of mind in artificial intelligence— and some systems are on the point of passing. No AIs have passed the tests yet, but one got extremely close. We probably don't need to worry about robots that can recognise themselves in mirrors. But we might want to be more open to the idea that human intelligence isn't quite as special as we like to think.

【推荐2】The last decade saw the rise of the field of “plant neurobiology (神经生物学)”. That debatable field is based on the idea that plants——which do not possess brains ——handle information in ways similar to complicated animal nervous systems. This thinking implies that plants could feel happiness or sorrow or pain, make intentional decisions and even possess consciousness. But the chances of that are “effectively zero," Lincoln Taiz and colleagues write in an opinion piece in Trends in Plant Science. "There's nothing in the plant remotely comparable to the complexity of the animal brain," says Taiz, from the University of California, Santa Cruz.

Some plants are capable of complicated behavior. Wounded leaves can send warning signals to other parts of the plant, and harmful chemicals can warn animals that eat them. Some plants may even have a version of short-term memory: Tiny sensing hairs can count the number of touches that come from a clumsy insect. But plants perform these with equipment that's very different from the nervous systems of animals, no brain required, Taiz argues.

He and colleagues point out methodological (方法的) faults in some of the studies that claim plants have brain-like command centers, animal-like nerve cells and changing patterns of electricity that are similar to activity found in animal brains. But beyond the debate over how these studies are conducted, Taiz's team argues that plant consciousness doesn't even make sense from an evolutionary (进化的) point of view.

Complicated animal brains advanced in part to help a living being catch a meal and avoid becoming one, Taiz says. But plants are rooted to the ground and rely on sunlight for energy, an inactive lifestyle that doesn't require quick thinking or outsmarting a predator (捕食者)——or the energetically expensive nervous systems that enable those behaviors.

“What use would consciousness be to a plant?” Taiz asks. The energy required to power awareness would be too costly, and the benefit from such awareness too small. If a plant worried and suffered when faced with a threat, it would be wasting so much energy that it wouldn't have any left to do anything about that threat, Taiz says.

Imagine a forest fire. "It's unbearable to even consider the idea that plants would be conscious beings aware of the fact that they're being burned to ashes, watching the young trees die in front of them," Taiz says. The frightening scene illustrates "what it would actually cost a plant to have consciousness."

Furthermore, plants have plenty to do without having to be conscious, too. With sunlight, carbon dioxide and water, plants create the compounds (化合物) that sustain much of the rest of life on Earth, Taiz points out. "Isn't that enough?"

【推荐3】I’ve recently found myself wondering if I could do without Google Maps. It is, I think, the only app on my phone I’d really miss were I to swap my smartphone for a “dumb” one that handles only calls and text messages.

Why am I thinking about this? It’s because every time I try to read a book, I end up picking up my phone instead. I keep interrupting my own train of thought in order to do something that I don’t consciously want to do.

This is not accidental. Developers have become even more unashamed in their attempts to keep us hooked on our smartphones. Some of them speak in the language of addiction and behavioural psychology, though most prefer the term “persuasive tech”. In itself, persuasive tech is not a new idea — an academic named BJ Fogg has been running classes from a “persuasive tech lab” at Stanford since the late 1990s. But as smartphone ownership has rocketed and social-media sites have been born, persuasive tech has vastly expanded its reach.

One company, Dopamine Labs — named for the chemical released in the reward center of the brain — offers a service to tech businesses wanting to “keep users engaged”. Founder Ramsay Brown tells me he wants people to understand that “their thoughts and feelings are on the table as things that can be controlled and designed”. He thinks there should be more conversation around the persuasive power of the technologies being used. “We believe everyone has a right to cognitive liberty, and to build the kind of mind they want to live in,” he says.

The poster child of the resistance movement against addictive apps is former Google “design ethicist” Tristan Harris. He thinks the power to change the system lies not with app developers but with the hardware providers. In 2014, Harris founded “Time Well Spent”, a group that campaigns for more moral design practices among developers.

Any tech business that relies on advertising profits is motivated to hold its users online for as long as possible, Harris says. This means apps are specifically designed to keep us in them. Apple, on the other hand, wants to sell phones but doesn’t have a profit stream so tightly connected to the amount of time its customers spend online. Harris hopes that companies like Apple could use their influence to encourage more morally designed apps.

While I wait for Apple to sort this out, I find myself longing for something called a “Light Phone”, a credit-card-sized handset that does absolutely nothing but make and receive calls. Price tag? $150. Seems expensive. But the company’s website is very persuasive.

【推荐1】In 2008, someone, or perhaps a group of people, using the name Satoshi Nakamoto published a paper to an online group that discussed cryptography（密码使用法）. That paper described a process that would use cryptography to create a secure electronic cash system, now known as a cryptocurrency（ 加密货币）. Person to person payment could be made online using a shared network of computers instead of a bank or other financial institution. Each deal could happen very quickly. The shared network of computers would also serve as the means to prove those deals safely. Getting rid of the need for a centralized banking system would open up the possibility for anyone to become part of the digital economy.

Today, there are well over a thousand different cryptocurrencies. Most are still trying to be feasible global payment system like Bitcoin. They are held back by problems affecting the entire cryptocurrency industry.

One issue is weak security on cryptocurrency websites where users either store their electronic cash in virtual “wallets” or exchange one kind of electronic cash for another. In recent years, clever thieves have broken into many of these websites and stolen electronic cash. The websites are struggling to protect their users from such thefts.

Another problem is the large number of fake cryptocurrencies that are advertised on the internet. The advertisements invite internet users to visit websites offering new cryptocurrencies. Many visitors are persuaded by the websites to buy their cryptocurrencies using actual money. Later, the webistes disappear along with the victims’ money. In response to this problem, companies like Facebook and Google are limiting cryptocurrency advertising on their websites.

【推荐3】Around the world COVID-19 has messed up children’s education. They began to be shut out of classrooms. Even in countries where schools have stayed open, lessons and tests have been interrupted. Some countries pressed ahead with national exams this year. A few others, including Britain, France and Ireland, cancelled them all. They came up with new ways of awarding grades instead. The fact that big exams have proved so vulnerable to interruption has led to new questions about their usefulness. Are there better ways of measuring what children have learned?

Exams have plenty of problems. They are often unreliable; a study in Israel found that test-takers’ performance can be affected by smog. Many children find them stressful. Plenty of places run them badly. Poorly written test papers in developing countries lead to wild swings in pass rates. Countries, including Algeria and Ethiopia, have shut down the Internet at exam time to prevent cheating.

Yet most of the world’s best-performing school systems keep some kind of important tests, and for good reason. Other kinds of assessments are rarely better and many are worse. For example, if teachers are responsible for assessing their pupils, they may strengthen their own biases. Studies have caught them giving lower grades to students from ethnic minority or those who are fat. Giving up exams does not always ease pupils’ anxiety. Some would rather be tested at the end of their course than have their work constantly assessed. Coursework can waste students’ efforts by encouraging them to make slight changes to a few projects endlessly. That leaves less time for other kinds of learning.

Governments may need to adjust next year’s tests. That could mean cutting the amount of material to be tested. Exam boards may also have to increase the grades of pupils who have spent the most time out of the classroom. Many pupils have studied harder throughout this difficult year. They should have the chance to sit exams to earn the grades they deserve.