China's tourism market boom over the three-day New Year's Day holidays did not end with the holidays. Over the past several days, bustling scenes of tourists enjoying ice and snow activities in Harbin in Northeast China's Heilongjiang Province and sunshine in South China's Hainan Province have become hot topics in China and abroad.

The busy, lively scenes are not limited to Harbin and Hainan. Other parts of China, including Northwest China's Xinjiang Uygur Autonomous Region, are also seeing robust growth in the number of tourists and revenues they generate. The tourism boom is expected to last through the Chinese Lunar New Year holidays, which is about a month away, according to travel agencies and experts.

The tourism boom not only illustrates the vitality and potential of China's consumption market, but also paves the way for the overall economic recovery in 2024, experts said, with some predicting solid economic recovery this year, though further policy measures are needed to tackle pressure and challenges.

On Friday, Harbin officially kicked off its annual International Ice and Snow Festival, declaring a public holiday. The festival also opened along with the launch of the China-France Year of Culture and Tourism, according to a statement from the Ministry of Culture and Tourism on Friday.

The opening of the International Ice and Snow Festival comes as Harbin became a sensation for its winter tourism boom since the New Year's Day holidays, attracting hundreds of millions of views and comments on social media platforms. Video footage of tourists in winter clothes dancing to music in Harbin posted by China Media Group has attracted more than 13.18 million views on Sina Weibo as of Friday afternoon.

While a final tally on attendees at the festival was not yet available on Friday, Harbin has already seen robust numbers. During the three-day New Year's holidays, the city saw about 3.05 million tourist trips and a total tourism revenue of about 5.91 billion yuan ($832 million) - both are historical highs, according to local official data.

Harbin is not alone in seeing a tourism boom. Xinjiang, which has become a top tourist spot in China for its beautiful nature and culture, also saw rapid growth in trips and revenue. During the New Year's Day holidays, Xinjiang received more than 1.66 million trips, up 195 percent year-on-year, and generated about 1.76 billion yuan in tourism revenue, up 424.3 percent year-on-year, according to local data.

Meanwhile, Hainan, which is known for its warm weather in the winter, also saw growth rates of over 60 percent in both trip numbers and tourism revenue over the New Year's Day holidays. More importantly, bookings for Hainan for the upcoming Chinese Lunar New Year holidays are already picking up pace, according to media reports.
Support for economic recovery

"As the Chinese Lunar New Year holidays approach, it is expected that the tourism market nationwide will continue to see a relatively big boom," Chen Fengying, an economist and former director of the Institute of World Economic Studies at the China Institutes of Contemporary International Relations, told the Global Times.

Chen, who was visiting Hainan, said that the tourism market in the province is "very hot" and consumers' willingness to travel is also "relatively high," which "will provide support for China's economic recovery," she said.

The tourism boom means increased spending and businesses activity for companies in a wide range of areas. For example, after Harbin became a sensation, various companies have seen rapid growth in business. Notably, share prices of Changbai Mountain Tourism Co, which is based in Northeast China's Jilin Province, surged more than 51 percent over the past five days.

As the ice-and-snow fever continues to grow after the Beijing Winter Olympics in 2022, China's winter tourism market is rising rapidly, benefiting areas such as Northeast China and Xinjiang, where ice and snow activities are popular. The China Tourism Academy predicted that during the 2024-2025 ice and snow season, a total of 520 million trips and a revenue of 720 billion yuan are expected.

Cao Heping, an economist at Peking University, said that he has been traveling across the country since the beginning of the year and has seen a robust recovery in the tourism industry.

"The rebound in consumer demand also reflects the development trend of China's economy. The recovery of consumption has a positive impact on consumer confidence and further boosts economic recovery," Cao told the Global Times on Friday.

The tourism boom has also lifted expectations among economists for China's economic recovery in 2024, with many also pointing to ramped up policy measures to boost consumption and other growth drivers.

Yu Yongding, an academic member of the Chinese Academy of Social Sciences and a prominent economist, wrote in an article shared with the Global Times on Friday that China's GDP growth target "should not be lower than 5 percent in 2024."

Yu also noted that to boost consumption, efforts must be taken to first increase residents' incomes, and consumption and investment, the two main growth drivers, should be in a virtuous cycle in which they promote each other. The article was first published on the WeChat account of China Finance 40 Forum.

Cao also said that amid challenges such as insufficient demand, policy support should be further intensified in several areas, including using various monetary policy tools to ensure ample liquidity to boost confidence among businesses and consumers, and support for new technologies and new emerging industries should also be increased.

"If all policies are carried out according to plan, I think it's possible that our GDP growth rate could hit as much as 5.5 percent in 2024," Cao said.

The Inter-Civilizational Communication and Global Development Forum kicked off in Beijing on Tuesday, attracting around 150 experts from more than 30 countries. 

The three-day event, hosted by the Party School of the Central Committee of the Communist Party of China (CPC), takes "tradition of civilization and paths to modernization" as its theme. Politicians, entrepreneurs, think tank experts, scholars, cultural ambassadors and diplomatic envoys from China and abroad have gathered together to discuss issues concerning communication among civilizations and global development.

 "The purpose of hosting this forum is to establish an international exchange platform for various parties to participate and converse with each other, contributing wisdom and strength to promote the exchange and mutual learning of civilizations among nations and to build a community with shared future for humanity," said Xie Chuntao, vice president of the Party School of the Central Committee of the CPC.

Dilma Rousseff, president of the New Development Bank gave a speech at the opening ceremony, noting that frank and respectful dialogue between different civilizations and countries will promote consensus and cooperation. She added that it is a guiding principle that the world needs to systematically follow.

 "The rich diversity of human civilizations can no longer be dismissive. The different objectives and development models followed by different nations cannot be ignored. It is not possible for a multicultural world to be forced to choose a single path. Often, they are looking with a single view of democracy, which actually leads to the weakening of democracies in many countries," she said, commenting on the significance of the forum.

Herta Daubler-Gmelin, former German justice minister, pointed out that besides cooperation in the economic and political fields, people-to-people cooperation in academic field is also very crucial.

 "We can do more. We can do better. This means information, as well as transparency in communication. And the recognition that every civilization contains dynamic elements. It's not frozen. It can open itself to converse with others," she said.

China's State Council Information Office released a white paper titled A Global Community of Shared Future: China's Proposals and Actions in September. John L. Thornton, chair emeritus of the Brookings Institution and co-chair of the Asia Society, quoted the white paper, pointing out that the most pressing task is to find a guiding beacon for the sustainable development of human civilization.

"There is no more important topic than the one we will be discussing this morning. I think of it as discussing the world we wish to be in, the world we wish to create for ourselves, our children, our grandchildren, and all future generations," said Thornton.

He also applauded for the Global Civilization Initiative and Global Initiative. "The aspiration China has is admirable. If it can be achieved, it will be a step forward for mankind, for the world," Thornton told the Global Times.

Three sub-forums on civilizational communication between China and Europe, China-Central Asia modernization development and leadership building, and China-Arab civilization exchange and modernization development, as well as a round-table discussion, will be held during this forum.

Sperm from stressed-out dads can carry that stress from one generation to another. “But one question that really hasn’t been addressed is, ‘How do dad’s experiences actually change his germ cell?’” Jennifer Chan, a neuroendocrinologist at the University of Pennsylvania, said November 13 in Washington, D.C., at the annual meeting of the Society for Neuroscience.

Now, from a study in mice, Chan and her colleagues have some answers, and even hints at ways to stop this stress inheritance.
The researchers focused on the part of the male reproductive tract called the caput epididymis, a place where sperm cells mature. Getting rid of a stress-hormone sensor there called the glucocorticoid receptor stopped the transmission of stress, the researchers found. When faced with an alarming predator odor, offspring of chronically stressed mice dads overproduce the stress hormone corticosterone. But mice dads that lacked this receptor in the epididymis had offspring with normal hormonal responses.

Earlier work has shown that epididymis cells release small packets filled with RNA that can fuse to sperm and change their genetic payload. Experiments on cells in dishes revealed that chronic exposure to corticosterone changed the RNA in these vesicles. The results offer an explanation of how stress can change sperm: By activating the glucocorticoid receptor, stress tweaks the RNA in epididymis vesicles. Then, those vesicles deliver their altered contents to sperm, passing stress to the next generation.

Similar vesicles are present in human seminal fluid, even after ejaculation. Chan and colleagues are testing whether humans carry similar signs of stress in these RNA-loaded vesicles by studying college students’ semen samples. Exam schedules will be used as a stress indicator, she said.

Human activities are driving phosphorus levels in the world’s lakes, rivers and other freshwater bodies to a critical point. The freshwater bodies on 38 percent of Earth’s land area (not including Antarctica) are overly enriched with phosphorus, leading to potentially toxic algal blooms and less available drinking water, researchers report January 24 in Water Resources Research.

Sewage, agriculture and other human sources add about 1.5 teragrams of phosphorus to freshwaters each year, the study estimates. That’s roughly equivalent to about four times the weight of the Empire State Building. The scientists tracked human phosphorus inputs from 2002 to 2010 from domestic, industrial and agricultural sources. Phosphorus in human waste was responsible for about 54 percent of the global load, while agricultural fertilizer use contributed about 38 percent. By country, China contributed 30 percent of the global total, India 8 percent and the United States 7 percent.

High-energy particle beams can reveal how 2-D thin sheets behave when the heat is cranked up.

Researchers have devised a way to track how these materials, such as the supermaterial graphene, expand or contract as temperatures rise (SN: 10/3/15, p. 7). This technique, described in the Feb. 2 Physical Review Letters, showed that 2-D semiconductors arranged in single-atom-thick sheets expand more like plastics than metals when heated. Better understanding the high-temp behaviors of these and other 2-D materials could help engineers design sturdy nano-sized electronics.
Commonly used silicon-based electronics are “hitting a brick wall,” regarding how much smaller they can get, says Zlatan Aksamija, an electrical engineer at the University of Massachusetts Amherst not involved in the work. Materials made of ultrathin, 2-D films could be ideal for building the next generation of tinier devices.

But electronics warm up as electric current courses through them. If 2-D materials in a nanodevice expand or shrink at different rates from each other when heated, that could change the device’s electronic properties — such as how well it conducts electricity, says Antoine Reserbat-Plantey, a physicist at the Institute of Photonic Sciences in Barcelona not involved in the research. It’s crucial to know how the thin films react to higher temps.

The new method uses a scanning transmission electron microscope to bombard a film with a beam of high-energy particles. That particle beam stirs up electrons in the 2-D sheet, making the electrons swish back and forth through the material. The collective oscillation, called a plasmon, occurs at a frequency that depends on the material’s density, explains Matthew Mecklenburg, a physicist at the University of Southern California in Los Angeles who was not involved in the work.

The plasmon frequency affects how much energy the particles of the microscope beam lose as they streak through the 2-D material: the higher the frequency, the denser the material, and the more energy that is sapped from the beam. By using another instrument to measure the energies of beam particles after they’ve passed through the 2-D material, researchers can discern the material’s density — and track how that density changes as they turn up the heat.
Robert Klie, a physicist at the University of Illinois at Chicago, and colleagues used this technique on samples of graphene, which is made of carbon atoms, and four 2-D semiconductors made of transition metal and chalcogen atoms. (Chalcogen elements are found in group 16 on the periodic table and include sulfur and selenium). These materials were arranged in sheets from a single atom to a few atoms thick. The team measured the density of each sample at eight temperatures between about 100° and 450° Celsius. That allowed the scientists to calculate how much each material expanded or contracted per degree of temperature increase.

These measurements revealed that the thinnest structures undergo more significant size changes than thicker sheets: A single layer of graphene, which contracts when heated, shrinks more than materials composed of a few graphene layers. The 2-D semiconductors expand at higher temps, but those made of one-atom-thick sheets swell more than semiconductors a few atoms thick. In fact, the heat response of the single-atom-thick semiconductors is “more like [that] of a plastic than a metal,” Mecklenburg says.

This finding may indicate that, like plastics, some 2-D semiconductors have low melting temperatures, which could affect how or whether they’re used in future electronics.

Harbor porpoises are frequently exposed to sounds from shipping vessels that register at around 100 decibels, about as loud as a lawnmower, scientists report February 14 in Proceedings of the Royal Society B. Sounds this loud can cause porpoises to stop echolocation, which they use to catch food.

While high-frequency submarine sonar has been found to harm whales (SN: 4/23/11, p. 16), low-frequency noise from shipping vessels is responsible for most human-made noise in the ocean, the researchers say. Porpoises have poor hearing in lower frequencies, so it was unclear if they were affected.

In the first study to assess the effects of shipping vessel noise on porpoises, researchers tagged seven harbor porpoises off the coast of Denmark with sensors that tracked the animals’ movement and echolocation usage in response to underwater noise over about 20 hours.

One ship created a 130 decibel noise — twice as loud as a chainsaw — that caused a porpoise to flee at top speed. These initial results indicate that ship noise could affect how much food porpoises hunt and consume.

When you’re pregnant, you spend a lot of time on scales. Every doctor appointment begins with hopping (or waddling) up for a weigh-in. Health care workers then plot those numbers into a (usually) ascending curve as the weeks go by.

A morbid curiosity about exactly how enormous you’re getting isn’t what’s behind the scrutiny. Rather, the pounds put on during pregnancy can give clues about how the pregnancy is progressing.

Weight gain during pregnancy is tied to the birth weight of the new baby: On average, the more weight that mothers gain, the bigger the babes. If a mother gains a very small amount of weight, her baby is more likely to be born too early and too small. And if a mother gains too much weight, her baby is at risk of being born large, which can cause trouble during delivery and future health problems for babies.
But staying within the recommended weight range is hard. Very hard. A 2017 review of studies that, all told, looked at over a million pregnancies around the world showed that the vast majority of women fell outside the weight gain sweet spot. Twenty-three percent of those women didn’t gain enough, and 47 percent gained too much, the review, published in JAMA, shows.

But here’s the tricky part. Many studies on weight gain during pregnancy and babies’ outcomes start monitoring women who are already pregnant. That means that these studies rely on women to remember, and report correctly, their prepregnancy weight. And that might not always be accurate.

A new study offers a more nuanced look at pregnancy weight gain. The results, taken from the pregnancies of more than 1,000 Chinese women, suggest that when it comes to babies’ birth weights, the timing of maternal weight gain matters, a lot.
Overall, a woman’s weight gain during pregnancy was clearly linked to baby’s weight at birth, the researchers found. But within those 40 weeks, there were big differences. Prepregnancy weight and weight gain during the first half of pregnancy are the measurements that matter, researchers suggested in the February JAMA Pediatrics. Weight gain after 18 weeks wasn’t linked to babies’ birth weight, researchers note.

Similar results, described in PLOS ONE, come from a 2017 study of Vietnamese women: Weight gain during the first half of pregnancy had two to three times the influence on infant birth outcomes than weight gain in the second half of pregnancy. It’s worth mentioning that nearly three-quarters of the Vietnamese women gained too little weight during pregnancy. And on the whole, the Chinese women were lean before they got pregnant, scenarios that make it hard to translate those findings to women who began pregnancy overweight.

Still, the point remains that weight gain during the first half of pregnancy (and even before it) may have outsized influence on the baby’s growth. Pregnancy — and the growing baby — change so much from week 0 to week 40. It makes sense that all pregnancy weight gain isn’t all one and the same.

It’s nice to see these complexities emerge as scientists get more fine-grained data. There’s still so much we don’t know about how weight gain during pregnancy, as well as other aspects of the in utero environment, can shape babies’ future health.

For the first time, scientists may have detected hints of the universe’s primordial sunrise, when the first twinkles of starlight appeared in the cosmos.

Stars began illuminating the heavens by about 180 million years after the universe was born, researchers report in the March 1 Nature. This “cosmic dawn” left its mark on the hydrogen gas that surrounded the stars (SN: 6/8/02, p. 362). Now, a radio antenna has reportedly picked up that resulting signature.
“It’s a tremendously exciting result. It’s the first time we’ve possibly had a glimpse of this era of cosmic history,” says observational cosmologist H. Cynthia Chiang of the University of KwaZulu-Natal in Durban, South Africa, who was not involved in the research.

The oldest galaxies seen directly with telescopes sent their starlight from significantly later: several hundreds of millions of years after the Big Bang, which occurred about 13.8 billion years ago. The new observation used a technique, over a decade in the making, that relies on probing the hydrogen gas that filled the early universe. That approach holds promise for the future of cosmology: More advanced measurements may eventually reveal details of the early universe throughout its most difficult-to-observe eras.

But experts say the result needs additional confirmation, in particular because the signature doesn’t fully agree with theoretical predictions. The signal — a dip in the intensity of radio waves across certain frequencies — was more than twice as strong as expected.

The unexpectedly large observed signal suggests that the hydrogen gas was colder than predicted. If confirmed, this observation might hint at a new phenomenon taking place in the early universe. One possibility, suggested in a companion paper in Nature by theoretical astrophysicist Rennan Barkana of Tel Aviv University, is that the hydrogen was cooled due to new types of interactions between the hydrogen and particles of dark matter, a mysterious substance that makes up most of the matter in the universe.
If the interpretation is correct, “it’s quite possible that this is worth two Nobel Prizes,” says theoretical astrophysicist Avi Loeb of Harvard University, who was not involved with the work. One prize could be given for detecting the signature of the cosmic dawn, and another for the dark matter implications. But Loeb expresses reservations about the result: “What makes me a bit nervous is the fact that the [signal] that they see doesn’t look like what we expected.”

To increase scientists’ confidence, the result must be verified by other experiments and additional tests, says theoretical cosmologist Matias Zaldarriaga of the Institute for Advanced Study in Princeton, N.J. Several other efforts to detect the signal are already under way.

Experimental cosmologist Judd Bowman of Arizona State University in Tempe and colleagues teased out their evidence for the first stars from the impact the light had on hydrogen gas. “We don’t see the starlight itself. We see indirectly the effect that the starlight would have had” on the cosmic environment, says Bowman, a collaborator on the Experiment to Detect the Global Epoch of Reionization Signature, EDGES, which detected the stars’ traces.
Collapsing out of dense pockets of hydrogen gas early in the universe’s history, the first stars flickered on, emitting ultraviolet light that interacted with the surrounding hydrogen. The starlight altered the proportion of hydrogen atoms found in different energy levels. That change caused the gas to absorb light of a particular wavelength, about 21 centimeters, from the cosmic microwave background — the glow left over from around 380,000 years after the Big Bang (SN: 3/21/15, p. 7). A distinctive dip in the intensity of the light at that wavelength appeared as a result.

Over time, that light’s wavelength was stretched to several meters by the expansion of the universe, before being detected on Earth as radio waves. Observing the amount of stretching that had taken place in the light allowed the researchers to pinpoint how long after the Big Bang the light was absorbed, revealing when the first stars turned on.

Still, detecting the faint dip was a challenge: Other cosmic sources, such as the Milky Way, emit radio waves at much higher levels, which must be accounted for. And to avoid interference from sources on Earth — like FM radio stations — Bowman and colleagues set up their table-sized antenna far from civilization, at the Murchison Radio-astronomy Observatory in the western Australian outback.

Scientists hope to use similar techniques with future, more advanced instruments to map out where in the sky stars first started forming, and to reveal other periods early in the universe’s history. “This is really the first step in what’s going to become a new and exciting field,” Bowman says.

A new molecule that reveals active tuberculosis bacteria in coughed-up mucus and saliva could simplify TB diagnoses and speed up tests for detecting strains of the disease that are resistant to drugs.

This synthetic molecule is a modified version of a sugar that TB bacteria consume to help build their cell walls. The sugar is tagged with a dye that lights up under a fluorescent microscope — but only if the dye isn’t surrounded by water. Dubbed DMN-Tre, the hybrid molecule stays dark until it enters a fatty, water-repellant layer in a TB bacterium’s cell wall, where it starts to glow, researchers report online February 28 in Science Translational Medicine.
Standard tests use dyes that stain a bunch of different bacteria, so technicians have to bleach the dye off everything except the TB cells, says Sumona Datta, a tuberculosis researcher at Imperial College London not involved in the work. But that chemical washing is time-consuming and prone to error. Since DMN-Tre only glows when it’s gobbled up by TB or one of its close relatives, the molecule could offer a simpler, more reliable diagnosis, she says.
Tuberculosis killed 1.7 million people worldwide in 2016, according to the World Health Organization. And rampant resistance to drugs is making the disease harder to fight.
Chemical biologist Carolyn Bertozzi, a Howard Hughes Medical Institute investigator at Stanford University, and colleagues tested the new molecule on mucus-saliva mixtures hacked up by 16 people with tuberculosis. The molecule flagged TB microbes in the samples after a couple of hours, and it revealed similar amounts of bacteria as the standard staining technique — without the hassle of post-dye chemical washing.

“That’s pretty impressive,” says Jianghong Rao, a chemist and radiologist at Stanford not involved in the work. But DMN-Tre needs to be tested in a larger clinical trial before being ready for prime time, he says.

The new TB screening technique may also have an edge in checking whether patients respond to treatment, says Eric Rubin, a microbiologist at Harvard University. Because the molecule only lights up when eaten by healthy, hungry TB bacteria, it won’t flag microbes that have been crippled or killed by antibiotics as typical tests do. So if there are still lots of glowing microbes in phlegm from patients treated with an antibiotic, a doctor knows to try a different drug.

While current drug-resistance tests can take weeks or months, DMN-Tre reveals how drug-treated bacteria are faring within a few hours. “That’s tremendously exciting,” says Carlton Evans, also a tuberculosis researcher at Imperial College London not involved in the study. Speedy drug-resistance tests (SN Online: 12/7/14) could help researchers predict sooner which antibiotics stand the best chance of taking down TB bacteria.

The search for neutron stars has intensified because of a relatively small area, low in the northern midnight sky, from which the strangest radio signals yet received on Earth are being detected. If the signals come from a star, the source broadcasting the radio waves is very likely the first neutron star ever detected. — Science News, March 16, 1968

Update
That first known neutron star’s odd pulsating signature earned it the name “pulsar.” The finding garnered a Nobel Prize just six years after its 1968 announcement — although one of the pulsar’s discoverers, astrophysicist Jocelyn Bell Burnell, was famously excluded. Since then, astronomers have found thousands of these blinking collapsed stars, which have confirmed Einstein’s theory of gravity and have been proposed as a kind of GPS for spacecraft (SN: 2/3/18, p. 7).