1 . Human speech contains more than 2,000 different sounds, from the common “m” and “a” to the rare clicks of some southern African languages. But why are certain sounds more common than others? A ground-breaking, five-year study shows that diet-related changes in human bite led to new speech sounds that are now found in half the world’s languages.

More than 30 years ago, the scholar Charles Hockett noted that speech sounds called labiodentals, such as “f” and “v”, were more common in the languages of societies that ate softer foods. Now a team of researchers led by Damián Blasi at the University of Zurich, Switzerland, has found how and why this trend arose.

They discovered that the upper and lower front teeth of ancient human adults were aligned (对齐), making it hard to produce labiodentals, which are formed by touching the lower lip to the upper teeth. Later, our jaws changed to an overbite structure (结构), making it easier to produce such sounds.

The team showed that this change in bite was connected with the development of agriculture in the Neolithic period. Food became easier to chew at this point. The jawbone didn’t have to do as much work and so didn’t grow to be so large.

Analyses of a language database also confirmed that there was a global change in the sound of world languages after the Neolithic age, with the use of “f” and “v” increasing remarkably during the last few thousand years. These sounds are still not found in the languages of many hunter-gatherer people today.

This research overturns the popular view that all human speech sounds were present when human beings evolved around 300,000 years ago. “The set of speech sounds we use has not necessarily remained stable since the appearance of human beings, but rather the huge variety of speech sounds that we find today is the product of a complex interplay of things like biological change and cultural evolution,” said Steven Moran, a member of the research team.

2 . It comes after more than half of soft drinks sold in shops have had their sugar levels cut by manufacturers (制造商) so they can avoid paying the tax. Drinks now contain 45 million fewer kilos of sugar as a result of manufacturers’ efforts to avoid the charge, according to Treasury figures. Since April drinks companies have been forced to pay between 18p and 24p for every litre of sugary drink they produce or import, depending on the sugar content.

However, some high sugar brands, like Classic Coca Cola, have accepted the sugar tax and are refusing to change for fear of upsetting consumers. Fruit juices, milk-based drinks and most alcoholic drinks are free of the tax, as are small companies manufacturing fewer than 1m litres per year.

Today’s figures, according to one government official, show the positive influence the sugar tax is having by raising millions of pounds for sports facilities (设施) and healthier eating in schools. Helping the next generation to have a healthy and active childhood is of great importance, and the industry is playing its part.

3 . Mr Titterton is chairman of the Omega Ensemble but has been the group’s official page turner for the past four years. His job is to sit beside the pianist and turn the pages of the score so the musician doesn’t have to break the flow of sound by doing it themselves. He said he became just as nervous as those playing instruments on stage.

“A lot of skills are needed for the job. You have to make sure you don’t turn two pages at once and make sure you find the repeats in the music when you have to go back to the right spot.” Mr Titterton explained.

Being a page turner requires plenty of practice. Some pieces of music can go for 40 minutes and require up to 50 page turns, including back turns for repeat passages. Silent onstage communication is key, and each pianist has their own style of “nodding” to indicate a page turn which they need to practise with their page turner.

But like all performances, there are moments when things go wrong. “I was turning the page to get ready for the next page, but the draft wind from the turn caused the spare pages to fall off the stand,” Mr Titterton said, “Luckily I was able to catch them and put them back.”

6 . Researchers say they have translated the meaning of gestures that wild chimpanzees（黑猩猩）use to communicate. They say wild chimps communicate 19 specific messages to one another with a "vocabulary" of 66 gestures. The scientists discovered this by following and filming groups of chimps in Uganda, and examining more than 5, 000 incidents of these meaningful exchanges.

Dr Catherine Hobaiter, who led the research, said that this was the only form of intentional communication to be recorded in the animal kingdom. Only humans and chimps, she said, had a system of communication where they deliberately sent a message to another group member.

"That's what's so amazing about chimp gestures, " she said. "They're the only thing that looks like human language in that respect."

Although previous research has shown that apes and monkeys can understand complex information from another animal's call, the animals do not appear to use their voices intentionally to communicate messages. This was a significant difference between calls and gestures, Dr Hobaiter said.

Chimps will check to see if they have the attention of the animal with which they wish to communicate. In one case, a mother presents her foot to her crying baby, signaling: "Climb on me." The youngster immediately jumps on to its mother's back and they travel off together. "The big message from this study is that there is another species（物种）out there that is meaningful in its communication, so that's not unique to humans, " said Dr Hobaiter.

Dr Susanne Shultz, an evolutionary biologist from the University of Manchester, said the study was praiseworthy in seeking to enrich our knowledge of the evolution of human language. But, she added, the results were "a little disappointing".

"The vagueness of the gesture meanings suggests either that the chimps have little to communicate, or we are still missing a lot of the information contained in their gestures and actions, " she said. "Moreover, the meanings seem to not go beyond what other animals convey with non-verbal communication. So, it seems the gulf remains."

7 . A trial project by the Montreal Children’s Hospital suggested that the use of medical hypnosis (催眠) can reduce pain and anxiety in patients. The project also resulted in a reduction in the amount of medicines used to perform medical-imaging (医学影像) procedures.

“During the examination children don’t move. It works perfectly. It’s amazing,” said Johanne L’Ecuyer, a medical-imaging technologist at the hospital.

The project was inspired by a French team from Rouen University Hospital Centre where examinations are done under hypnosis instead of general anesthesia (麻醉).

A French medical-imaging technologist—also a hypnotist—was invited to train a few members in the medical-imaging department of the children’s hospital. In all, 80 examinations were conducted for the project between January and September, 2019, focusing on the imaging procedures that would cause anxiety.

Hypnosis is not a state of sleep: It is rather a modified (改变的) state of consciousness. The technologist will guide the patient to this modified state—an imaginary world that will disassociate itself more and more from the procedure that follows.

“The technologist must build up a story with the patient,” Ms. L’Ecuyer said. “The patient is left with the power to choose what he wants to talk about. Do you play sports? Do you like going to the beach? We establish a subject that we will discuss throughout the procedure.”

Everything that happens next during the procedure must be related to this story—an injection (注射) becomes the bite of an insect; the heat on the skin becomes the sensation of the sun and a machine that rings becomes a police car passing nearby.

“The important thing is that the technologist associates what is happening outside the patient’s body with what the patient sees in his head,” Ms. L’Ecuyer said. “It requires creativity on the part of the technologist, imagination, a lot of patience and kindness.”

The procedure appealed to the staff a lot when it was introduced in January. “It spread like wildfire that someone from France was here to train the technologists,” Ms. L’Ecuyer said. She added that she had a line of staff at her door wanting to take the training

8 . When almost everyone has a mobile phone, why are more than half of Australian homes still paying for a landline(座机)?

These days you'd be hard pressed to find anyone in Australia over the age of 15 who doesn't own a mobile phone. In fact plenty of younger kids have one in their pocket. Practically everyone can make and receive calls anywhere, anytime.

Still, 55 percent of Australians have a landline phone at home and only just over a quarter (29%) rely only on their smartphones, according to a survey(调查). Of those Australians who still have a landline, a third concede that it's not really necessary and they're keeping it as a security blanket—19 percent say they never use it while a further 13 percent keep it in case of emergencies. I think my home falls into that category.

More than half of Australian homes are still choosing to stick with their home phone. Age is naturally a factor（因素）—only 58 percent of Generation Ys still use landlines now and then, compared to 84 percent of Baby Boomers who've perhaps had the same home number for 50 years. Age isn't the only factor; I'd say it's also to do with the makeup of your household.

Generation Xers with young families, like my wife and I, can still find it convenient to have a home phone rather than providing a mobile phone for every family member. That said, to be honest the only people who ever ring our home phone are our Baby Boomers parents, to the point where we play a game and guess who is calling before we pick up the phone (using Caller ID would take the fun out of it).

How attached are you to your landline? How long until they go the way of gas street lamps and morning milk deliveries?

9 . Art is everywhere. Any public space has been carefully designed by an artistic mind to be both functional and beautiful. Why, then, is art still so widely considered to be "the easy subject" at school, insignificant to wider society, a waste of time and effort?

Art can connect culture with commercial products in a way that not many other things can; art generates money and holds significant emotional and cultural value within communities. When people attend a concert, they are paying for music, sure, maybe even hotel rooms, meals, and transport, but they also gain an incredible experience, a unique atmosphere and a memory that will go through the rest of their lives. People don't just want material things anymore, they want to experience life-the arts are a perfect crossover（交迭）between culture and commerce.

Furthermore, the arts can bring communities together, reducing loneliness and making people feel safer. Social bonds are created among individuals when they share their arts experiences through reflection and discussion, and their expression of common values through artworks in honour of events significant to a nation's experience.

The arts clearly have a pretty positive impact on physical and psychological health. It is found that people who frequent cultural places or participate in artistic events are more likely to gain good health compared to those who do not; more engagement with the arts is linked to a higher level of people's wellbeing. The Royal Society of Public Health discovered that music and art, when used in hospitals, help to improve the conditions of patients by reducing stress, anxiety and blood pressure.

Children who are involved with the arts make greater achievements in their education: those engaged with drama have greater literary ability while others taking part in musical practice exhibit greater skills in math and languages. Kids with preference for the arts have a greater chance of finding employment in the future. Participating in the arts is essential for child development; encouraging children to express themselves in constructive ways could help to form healthy emotional responses in later life.

Vital to human life, art is celebrated and used by nations across the world for various purposes. Life without art would be boring and dead still, for art is a part of what makes us human.

10 . Early fifth-century philosopher St. Augustine famously wrote that he knew what time was unless someone asked him. Albert Einstein added another wrinkle when he theorized that time varies depending on where you measure it. Today’s state-of-the-art atomic(原子的) clocks have proven Einstein right. Even advanced physics can’t decisively tell us what time is, because the answer depends on the question you’re asking.

Forget about time as an absolute. What if, instead of considering time in terms of astronomy, we related time to ecology? What if we allowed environmental conditions to set the tempo(节奏) of human life? We’re increasingly aware of the fact that we can’t control Earth systems with engineering alone, and realizing that we need to moderate(调节) our actions if we hope to live in balance. What if our definition of time reflected that?

Recently, I conceptualized a new approach to timekeeping that’s connected to circumstances on our planet, conditions that might change as a result of global warming. We’re now building a clock at the Anchorage Museum that reflects the total flow of several major Alaskan rivers, which are sensitive to local and global environmental changes. We’ve programmed it to match an atomic clock if the waterways continue to flow at their present rate. If the rivers run faster in the future on average, the clock will get ahead of standard time. If they run slower, you’ll see the opposite effect.

The clock registers both short-term irregularities and long-term trends in river dynamics. It’s a sort of observatory that reveals how the rivers are behaving from their own temporal frame(时间框架), and allows us to witness those changes on our smartwatches or phones. Anyone who opts to go on Alaska Mean River Time will live in harmony with the planet. Anyone who considers river time in relation to atomic time will encounter a major imbalance and may be motivated to counteract it by consuming less fuel or supporting greener policies.

Even if this method of timekeeping is novel in its particulars, early agricultural societies also connected time to natural phenomena. In pre-Classical Greece, for instance, people “corrected” official calendars by shifting dates forward or backward to reflect the change of season. Temporal connection to the environment was vital to their survival. Likewise, river time and other timekeeping systems we’re developing may encourage environmental awareness.

When St. Augustine admitted his inability to define time, he highlighted one of time’s most noticeable qualities: Time becomes meaningful only in a defined context. Any timekeeping system is valid, and each is as praiseworthy as its purpose.