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At times when life threw screwballs at Johnson, McElroy was there to pick her up. During one2 time, he left her a voicemail that said, "Everything's gonna be fine. We'll3 it."

In 2024, McElroy4 a fall that left him a quadriplegic. Three and a half weeks later, he died of those injuries. But before that, while being by his bedside, Johnson5 with McElroy her dream of becoming the6 woman to skateboard across the country. He wanted to be part of it, and they planned that she would7 him in his wheelchair across the finish line.

She wasn't sure she could pull it off, but McElroy had8 in her.

"I was like, ‘Roger, it's a big country'. And he was like, ‘Well, you can do it'," Johnson told Good Morning America.

After McElroy's9 Johnson, then 29, chose to10 him by becoming the first woman to skateboard across the country. Along the way, she would raise money for Wings for Life, a non-profit that supports research into spinal cord injuries.

11 by a video crew, and wearing a locket around her neck that held McElroy's ashes, she began her journey last April at California's Santa Monica beach.12: Virginia Beach, 3,266 miles away.

Averaging 30 to 50 miles a day, Johnson's13 across America took her up and down mountains, past wheat fields and through cities, in rain and blistering heat. Through it all, Roger McElroy was riding with her: Everything's gonna be fine. We'll get through it.

On Aug.15, after 119 days, Johnson arrived at the Atlantic Ocean. No one was more14 than Johnson that she had completed what she'd started, while raising $50,000 for Wings for Life.

She told ABC News, "Roger left me15, and for that I thank him every day."

Embedded AI (具身智能), which integrates AI with physical objects such as robots, is emerging as a game-changing technology with limitless potential. For instance, Unitree Robotics, known for its dancing robots showcased at CCTV's Spring Festival Gala, demonstrates cutting-edge applications of embedded AI.

In industrial and agricultural settings, embedded AI can dramatically enhance operational efficiency. For homes and healthcare sectors, it offers personalized and intelligent solutions, such as AI-powered smart home systems that have already been widely adopted. Additionally, autonomous driving technologies, though still under refinement and testing, represent another promising avenue for embedded AI.

This innovative solution, jointly launched by Meituan Medicine and Galbot, represents the world's first humanoid robot-powered smart pharmacy system. It made its debut at the China International Fair for Trade in Services in September 2024. It autonomously plans its route, navigates to the required item, and uses advanced AI-powered vision and grasping technology to complete the task. This cutting-edge technology shows how AI is revolutionizing healthcare services.

A. It can also reduce costs and enable precise management.

B. China has played a leading role in the development of elderly care robots.

C. Several Chinese companies have already made significant strides in this area.

D. These robots can bring intelligent assistance to various aspects of everyday life.

E. One groundbreaking example of AI-driven robotics is the Galbot humanoid robot.

F. Designed for 24/7 autonomous operation, a Galbot robot can restock items efficiently.

G. Meanwhile, the automotive industry is also experiencing a rapid AI-driven transformation.

It turns out that the birds tense up their entire body to smash through wood, letting out short, explosive grunts with each strike, report Brown University biologist Nicholas Antonson and his colleagues in the Journal of Experimental Biology. "Woodpeckers really are nature's hammer in a sense," Antonson says.

To study how the birds tap, the researchers first humanely captured eight wild Downy Woodpeckers and carefully inserted electrodes into their muscles in the laboratory. The electrodes fed into a tiny, fitted backpack that recorded electrical signals from contracting muscles as the birds pecked. They also checked whether the woodpeckers held their breath during exertion (用力) (like weight lifters tend to do) or exhaled (呼气) (like tennis players) while striking the wood by examining airflow through the birds' air sacs — small, balloon-like structures that help them breathe in and out. By matching these measurements with high-speed videos, the scientists tracked the woodpeckers' taps down to every four milliseconds.

Instead of using a single muscle to control the action, woodpeckers activated "every muscle from the head to the tail," Antonson says. The birds used their powerful hip flexors to push forward, clenched their tail and abs (腹肌) to prepare for the strike, and stiffened the back of their head and neck on contact — similar to the way you might stiffen the back of your wrist when you hammer a nail. They then engaged a different set of hip and neck muscles to draw back.

The birds also perfectly paired their pecks with sharp exhalations "as another means of stabilizing their core muscles and powering through those strikes," Antonson explains. "To be able to breathe out 13 times per second and inhale on the order of 40 milliseconds is really impressive." Songbirds, which aren't closely related to woodpeckers, are the only other birds known to so precisely time their breaths, which they do as they sing.

"Pecking is a full-body exercise," says University of Alabama biologist Nicole Ackermans, who studies brain damage in woodpeckers and head-butting sheep. Coordinating "micro breaths" with muscle clenching and creating "this hammerlike structure in their whole body is such a unique approach," she adds.

Mnemonics are techniques to help you remember things. There are a variety of them, including rhymes, spelling acronyms and sentence mnemonics.

Rhymes are a great way to remember things. The sounds, unusual words and rhythm of them help you recall ideas. Do you know when Columbus sailed to America? There's a rhyme to help you which goes like this, "In fourteen-hundred and ninety-two, Columbus sailed the ocean blue." Most people who've heard that never forget it!

Spelling acronyms involve creating a sentence based on the letters of a target word. For example, the following sentence can help you with the spelling of the word "because", "Big elephants can always understand small elephants". Notice how the first letter of each word in the sentence spells out the word "because". And if you can't remember the spelling of the word "mnemonics", use this one "Mike never eats meat or nuts in case he's sick"!

Sentence mnemonics are also useful. The following can help you with the difference between the words "principal" and "principle", "A principal is your pal at school, and a principle is a belief or rule." Or this one to help you remember the difference in spelling between "deserts" (such as the Sahara) and "desserts" (such as Tiramisu), "A dessert has two sugars so it's sweeter, but a desert only has one." [The two "sugars" mentioned in the sentence refer to the two s's in the word "dessert".]

You can learn grammar rules with sentence mnemonics too. For example, this one can help you with the position of adjectives, "Adjectives come before nouns just as ‘A' comes before ‘N'." And this one can help you learn about the use of apostrophes (撇号), "Apostrophes show possession."

Mnemonics can help a lot with language learning. Why not try inventing a few of your own!

I feel like the online vibe was much more inclusive back then. I still remember the friendly debates about the various adaptations of Legends of the Condor Heroes. Everyone would share their thoughts and reasons. Just the other day, I saw a similar question on Xiaohongshu, but the discussion quickly turned into heated arguments. Back then, sharing resources for online novels or gaming strategies was common, but now, such requests can easily trigger online debates.

My parents loved playing Stephen Chow movies at home, which turned me into a belated fan of these classic 1990s Hong Kong comedies. At the core of his humor lies tragedy, yet his films also taught me simple values: be brave, be resilient, stay optimistic, and never give up on your dreams. To me, Stephen Chow feels like an old friend I've known for years — a forever-young legend. I wish I had been born earlier, in that golden era.

I'd describe myself as a severe nostalgia (怀旧) addict, especially when it comes to 90s architecture. Just looking at images of those buildings or walking near them brings me a sense of comfort. Though they've become relics of the past, nothing is truly forgotten.

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In the morning，I write this to-do list：

⒈Go to the bank.

⒉Get a nice haircut.

⒊Pick up my academic statement from college.

⒋Submit my poems.

I think， "That's enough for one day."

Up until a few years ago，I didn't aim to be anywhere.And in order to be nowhere，one does not need a to-do list as a guide.Focusing only on the most pressing matter in front of me was enough.Let the next urgent moment think for me.

My mother had tried to teach me about planning my day ever since I was 10.But I never practiced it until I was 25 and done with college.That's when I awoke to the fact that I didn't want to waste any more time.I live in Nigeria，where life and success can be difficult.There seem to be many roads to failure here.

I grew up seeing my mother firmly in charge of her day.She knew—and still knows—where she needed to be at every moment，in every detail.She may not be good at singing，acting，or sports.But she is excellent at planning.Every day she writes a list.I never understood why she had to write down a list that consists of items you can easily hold in your mind."Your to-do list is like your second mind，"she told my younger self."If you ever feel lost or overwhelmed，you consult your second mind."

I didn't understand what she meant by"a second mind"until I seemed to lose my first mind in my everyday life.Sometimes，it seems as though it's the rainy season in my mind，flooded with confused and distracting thoughts that lead nowhere.I need a second mind—now!

As I sit in the barbershop awaiting my nice haircut，a friend asks me， "What's next？"

"Pick up my academic statement from college，"I say."Then submit my poems."

"You've got it figured out like a granny，"he jokes.

"No，"I say， "like my mother."

Science serves as a powerful tool for unlocking the mysteries of the universe，but understanding its limitations is essential for its effective application.There are occasions where I have used the handle of a knife as a hammer（锤子），but the result would have been better if I' d had a more suitable tool at hand.As far as science goes，it is really good at testing things that are testable，but not so for those that are not.

We can do，and have done，an impressive amount with our brains.But there are limits.Sometimes these limits go away if we keep at it for long enough—we just need better facilities and experiments to get the answer.Breaking new ground in modern science this way can be costly.Next-generation supercomputers or incredibly large telescopes are expensive，yet these may be required to find answers to some of the unsolved mysteries of the universe.

Sometimes the limits we encounter in trying to unlock the nature of the universe are cognitive（认知的）.Think about this：human DNA is only about 1.2 percent different from that of chimps（黑猩猩）.Chimps are smart，no question.But could you teach them advanced mathematics？What if our DNA were another 1.2 percent further evolved than it is？What might our brains be capable of then？The level of abstract thinking might be un-imaginable.

Sometimes the limits we hit are fundamental.There are laws of nature we may never be able to understand，however advanced our brains might be-come.There are experiments we might never be able to perform.We may never be able to test what caused the universe to be created，and what caused the cause of the universe being created.This is where science may never break through.

For something to be considered scientific，it must，by definition，be testable.There is a problem here：it may not need to be testable right now，but it must be testable at some point in the future by experiment.If an idea is untestable，that doesn't mean it is wrong.It means it is untestable for now.These untestable ideas also happen to be some of the most interesting ones，probably because they' ve puzzled humanity for centuries.

All animals take in oxygen from the air they breathe in，and release CO2 from their blood when breathing out.Most mammals（哺乳动物） can't directly detect oxygen levels in the blood supplied to their tissues.Instead，they rely on the rising level of CO2 in their blood to signal that they might need to take a breath.But a recent study published in Science suggests seals（海豹） can sense the amount of oxygen in the blood，and change their diving behavior in response.

To find out if oxygen levels affected seal behavior，Professor McKnight at the University of St.Andrews and his colleagues created a special section in a pool where young seals were held.In one corner，there was a breathing chamber（呼吸室），where they were sheltered from the rain and the wind.

The breathing chamber was surrounded by panels that prevented surface swimming，yet swimming below the surface for about 200 feet would give the seals access to a feeder where they could eat as much fish as they liked.Once the seals got familiar with the setup，the researchers started to gradually change the composition of the air in the breathing chamber，in-creasing or reducing the levels of oxygen and CO2 to see an effect on their behavior.Sure enough：the higher the level of oxygen，the longer the seals stayed at the feeder.

The finding suggests that seals don't just physically respond to oxygen levels by changing their heart rate or breathing，but that they are sufficiently aware of them to change their behavior.This ability would put seals in a class beyond any land mammals that have been tested.Since oxygen levels on land remain stable，humans don't seem to have evolved（演化） to notice low blood oxygen levels，sometimes not even when they're about to pass out in free-diving.

Therefore，in free-diving without oxygen tanks，accidents are quite common.Our reliance on sensing CO2 levels in our blood instead of oxygen may be to blame.Actually，this is a perfectly reasonable strategy on land，where growing CO2 tends to signal breathing issues.But when holding our breath during diving，relying on CO2 levels is risky，especially on repeated dives.Because every time we surface and breathe in，our sensitivity to CO2 is decreased，even if its levels are already high，and this increases the chance that a person will，without awareness，pass out before they get to the surface.

My great grandmother received the dollhouse（玩具小屋） from a family friend back in the late 1800s.It was then passed down from generation to generation.I was seven when I discovered it under-neath the tree on Christmas morning.

In our house，Mom set up a sewing area.I sat at her sewing machine，my feet barely reaching the presser foot.Mom bent over me，her hands on mine，gently guiding small bits of cloth under the needle to create dollhouse bedding.She also taught me to make mini-blankets.With a little paint and glue，Mom demonstrated that anything could be turned into dollhouse furniture.I learnt to view the world as a place of possibility.I spent hours of my girlhood sitting before my dollhouse，telling made-up stories，and creating miniatures（缩微模型）.But eventually school activities took over，and the dollhouse was moved to the attic（阁楼）.

Over the next 40 years，the storytelling skills I'd practiced with the dollhouse grew into novel writing skills，and I developed a career as an author.One day，after hours of working on my fourth book，I took a break by surfing the Internet and happened to notice the beautiful dollhouses people posted on social media.They reminded me of mine.I went to the attic，brought it back to my room and started updating it.

During the mindless hours of sewing and furnishing（布置家具），I listened to audiobooks about the history of dollhouses，learning that they were not invented for play.There's a long，rich history of people in hardship turning to dollhouses to find comfort.They weren't produced as toys until mass production became standard after 1945.This inspired me to create a novel where art saves the day.

The truth was I myself needed art to save the day.Mom was then slip-passing away from me owing to progressive memory loss.The only topic we could discuss with any genuine joy was the update of the dollhouse.She loved retelling its history—those old memories.Mom didn't find it strange at all that her 50-year-old daughter was updating the dollhouse.She just thought it fun and beautiful.And it was.It was a world where Mom and I were at our best together.

Welcome to our university's Botanic Garden—plan your visit，and find out about what we do!

You can either pay at the Ticket Office on arrival，or book your tickets online.Please note：Tickets cannot be used on any date other than the one they were booked for and are non-refundable（不可退款的）.

Guidelines for Visitors

The Garden is an active research facility and a living museum with a collection of over 8，000 plants.

Please bear in mind some simple rules for your visit：

•Only trained working dogs are permitted to enter the Garden.

•Children must stay with a grown-up at all times.

•Stick strictly to the paths and lawns（草坪）.

•Do not climb the trees.

•Please do not pick any part of a growing plant.

•Cycling and ball games are not permitted in the Garden.

Guided Tours in the Garden

With over 8，000 plant species and a wonderful range of gardens and plantings to enjoy，there is something for everyone at the Garden，and many different aspects to appeal to a wide variety of interest groups.

Free Drop-in Weekend Tours

Enjoy a free-of-charge Garden tour with one of our expert guides，taking in the seasonal highlights of the Garden.

Our weekend tours are available every Sunday at 11：30 a.m.and 2 p.m.throughout the year.During the months of January and February these tours focus on the Winter Garden，Snowdrops and general winter interest.

The free tours last one hour and start from the Fountain，near the MainLawn.

Group Tours

Our experienced volunteer guides will help you enjoy the highlights and provide some of the background history and development of this amazing garden.

These 90-minute，pre-bookable tours are ideal for adult groups wishing to make the most of their visit to our 40-acre site.Please visit the Group Guided Tours page for more details.

Life is a road full of minor inconveniences and major setbacks，which everyone faces，

1 wealth or social rank. That is why optimism，the ability to see the 2 side of every negative situation，is key to success.

What made optimism so meaningful to me was when I 3 the A team of the basketball club for the upcoming season. I had always been the starting point guard，and my4 on the A team was something I took for granted. However，I only made the B team，5 I worked my hardest. I didn't understand why until I saw the new A team，crowded with players that all6 me. 

I had to give the B team a chance. But to my7 ，the play level was much lower than what I was used to. I lost the drive I'd had before and gradually became8 . 

One day I came across a social media post of another basketball team，whose point guard was much more9 than her teammates. When her team-mates made multiple mistakes10 ，which cost them several points，I expected her to be upset，but11 ，she patted her teammates on the back and comforted them. As I watched her more，I noticed that she led her team，always 12 and uplifting her teammates. 

The realization hit me like lightning. What I thought was a13 turned out to be a valuable opportunity，presenting a rare chance to develop14 . So，I started using my15 to be a leader for my team. When our coach needed a（n）16 ，I was the first to raise my hand. When my teammates needed help with a skill，I 17 taught them over and over again. My effort paid off as I18 remarkably not just as a player，but as a person—some-thing I could have never achieved on the A team. 

When facing challenges in life，some people19 them with optimism，while others tend to complain. Optimism is a palette（调色板），with which you can paint your own light in the darkness，shelter in a storm，and most importantly，a better20 of yourself!

—Congratulations!____.