The health of millions could be at risk because supplies of medicinal plants are being used up. These plants are used to make traditional medicine, including drugs to fight cancer. “The loss of medicinal plants is a quiet disaster,” says Sara Oldfield, secretary general of the NGO Botanic Gardens Conservation International.

    Most people worldwide rely on herbal (药草制的) medicines which are got mostly from wild plants. But some 15,000 of the 50,000 medicinal species are under threat of dying out, according to report from the international conservation group Plantlife. Shortages have been reported in China, India, Kenya, Nepal, Tanzania and Uganda.

    Over-harvesting does the most harm, though pollution and competition from invasive species (入侵物种) and habitat destruction all contribute. Businessmen generally harvest medicinal plants, not caring about sustainability (可持续性),” the Plantlife report says, “damage is serious partly because they have no idea about it, but it is mainly because such collection is unorganized”. Medicinal trees at risk include the Himalayan yew (紫衫) and the African cherry, which are used to treat some cancers.

    The solution, says the report's author, Alan Hamilton, is to encourage local people to protect these plants. Ten projects studied by Plantlife in India, Pakistan, China, Nepal, Uganda and Kenya showed this method can succeed. In Uganda, the project has kept a sustainable supply of low-cost cancer treatments, and in China a public-run medicinal plant project has been created for the first time.”

    “Improving health, earning an income and keeping cultural traditions are important in encouraging people to protect medicinal plants,” says Hamilton, “You have to pay attention to what people are interested in.”

Ghillean Prance, the former director of the Royal Botanic Gardens at Kew in London, agrees that medicinal plants are in need of protection. “Not nearly enough is being done,” he told New Scientist. “We are destroying the very plants that are of most use to us.”

    When I was 3 years old, I was found to be deaf in my left ear and have a small problem in my right. Being hard of hearing has been difficult, but I've never lived in a state of self-hating sorrow.

    Imagine being able to shut out all sounds as you lay your head down to sleep by simply rolling over onto one side. That's my reality when I sleep on my “good ear”, and it even makes me feel like a superhero sometimes.

    People call my deaf side my “bad ear”, but when I wear my hearing aid, I have access to a range of features(特征)that some other deaf people don't.

    In cinemas, for example, with one click of a button I can enjoy a whole film as though it were whispered to me from the mouths of the actors.

    Having a hearing aid hasn't always felt good, however.

    On the first day I got my aid, when I was 8, I took it to school for show-and-tell. As I explained how it worked to my classmates, a boy yelled out, “Aren't those for old men?”

    At that moment, I felt different. It took a long time for me to get over that sense of being so unlike my peers(同龄人).

    But it's not just choolkids who can make us deaf and hard-of-hearing people feel like burdens(负担).

    Every video on social media that lacks subtitles, for example, means an entire community of deaf people is unable to enjoy it.

    Completely deaf people are excluded from enjoying many movies too, as subtitles in cinemas are almost impossible to find.

    And with hearing aids costing around $2,500 each, it can be hard for many people to afford to be able to listen to the things that others take for granted.

    As for me, I can listen to music, enjoy films, and catch conversations – I'm lucky.

I'm deaf, but I can still hear everything. I've been blessed with wonderful life experiences.

Crocodiles today look very similar to ones from 200 million years ago. There are also very few species alive today—just 25. Other animals such as lizards (蜥蜴) and birds have achieved a diversity of many thousands of species in the same amount of time or less.

Prehistory also saw types of crocodile we don't see today, including giants as big as dinosaurs, plant-eaters, fast runners and snake-like forms that lived in the sea. The rate of their evolution is generally slow, but occasionally they evolve more quickly because the environment has changed. In particular, their evolution speeds up when the climate is warmer, and their body size increases.

The body size of crocodiles is important because it interacts with how fast animals grow, how much food they need, how big their populations are and how likely they are to become extinct. The limited diversity of crocodiles and their apparent lack of evolution is a result of a slow evolutionary rate. It seems the crocodiles arrived at a body plan that was very efficient and perfect enough that they didn't need to change it in order to survive. This perfection could be one explanation why crocodiles survived Cretaceous period (白垩纪), in which the dinosaurs died out.

Crocodiles generally develop better in warm conditions because they cannot control their body temperature and require warmth from the environment. The climate during the age of dinosaurs was warmer than it is today, and that may explain why there were many more varieties of crocodiles than we see now. Being able to draw energy from the sun means they do not need to eat as much as a warm-blooded animal like a bird or a mammal (哺乳动物).

Target Car Seat Trade-in Event

Frequently Asked Questions:

·What is the car seat trade-in program?

Guests who trade in their old car seats will receive a 20 percent off coupon toward a new car seat.

·What type of car seat qualifies for a trade-in?

Target will accept and recycle all types of car seats, including: baby car seats, car seat bases, as well as car seats that are damaged. Guests will receive a 20 percent off coupon for trading in any one of these items.

·Where do I bring my old car seat to trade in?

Car seats can be traded in at any of the Target stores. Target will have drop-off boxes for guests' unwanted car seats located near Guest Services.

·How do I redeem(兑现) the coupon offer?

Coupons can be applied to both in-store and online purchases and are valid(有效的) until May 31.

·What does Target do with the car seats that are traded in?

Materials from the old car seats will be recycled by Target's partner, Waste Management, to create new products such as plastic plates, plastic buckets and construction materials such as steel beams and carpet padding.

·Is this the first time Target has had car seat trade-in program?

Target introduced its first car seat trade-in program in April 2016. Since the program launched, more than 789, 000 car seats, or 11. 98 million pounds of car seats, have been recycled.

As the world struggles to deal with the climate crisis, some companies are working to remove polluting carbon dioxide from the air. {#blank#}1{#/blank#} But two US companies have recently made important progress. 

Scientists say large amounts of CO₂ must be removed from the CO₂ atmosphere and stored. {#blank#}2{#/blank#} But there's so much CO₂ in the atmosphere that just planting trees and protecting forests won't solve the problem. And, when plants and trees die, the carbon they've stored gets released again. 

That means humans need to come up with ways of removing carbon from the air and storing it. This is called Direct Air Capture (DAC). The science of removing carbon from the air is challenging, and it's still pretty new. {#blank#}3{#/blank#}So one puzzle for these companies is how to remove carbon without creating more pollution. 

A company called Heirloom has just opened the first DAC plant in the United States. The company heats up the limestone to separate out the CO₂, which is concrete. The process is extremely expensive. {#blank#}4{#/blank#}That's a tiny amount compared to how much carbon needs to be removed from the atmosphere, but the company says it hopes to remove a billion tons per year by 2035. 

 {#blank#}5{#/blank#} Some people worry that it will take too long for DAC technology to become powerful enough to make a difference. Others worry that focusing on removing carbon could take attention away from more important climate actions, like switching from fossil fuels to renewable energy. But experts say the decision isn't to do one or the other. The world needs to end fossil fuel use and pull carbon out of the air. 

A. Plants and trees do this naturally.
B. That's a huge and challenging goal.
C. Not everyone is excited about carbon removal.
D. Graphyte is another US company working on DAC.
E. The new plant can remove 1,000 tons of CO2 a year.
F. Most DAC processes require a large amount of energy.
G. As a matter of fact, CO₂ is just a small part of the gases that make up air.

A bot is a software program that often works by itself on the internet to perform the same kinds of actions as humans do. The report, produced by California-based internet security company Imperva, found that 49.6 percent of worldwide internet traffic ( 互联网流量） came from bots in 2023, while from human users fell to 50.4 percent. Imperva's study also found that web traffic linked to "bad bots" grew to 32 percent in 2023, a rise of 30.2 percent from 2022. Nanhi Singh, a security advisor at Imperva, said that bots are currently one of growing threats facing almost every industry.

Bots are generally designed to visit websites and independently search for many kinds of online information. They are able to operate at much greater speeds than humans and can process repeated searches and process large amounts of data. Online search advisor Yoast notes that some bots are considered good because they can be useful to individuals through tools such as OpenAI's chatbot, ChatGPT. Some others are considered malicious, because they are trained to hack, or break into network computer systems. These kinds of bots pretend themselves as humans and collect private data or financial information that can be used to commit crimes. And some bots are even designed to spread misinformation and false news.

The study also suggested that some countries have a much bigger problem with bad bots than others. Web traffic linked to bad bots in 2023 accounted for 71 percent in Ireland while Germany was next, with 67.5 percent. The percentage of Mexico and the USA was reported to be 42.8 percent and 35.4 percent respectively. Imperva even reported that bad bot activity would lead to account takeovers, which increased 10 percent in 2023 over 2022. The highest number of account takeovers – 36.8 percent–happened in the financial services industry. Next was the travel industry, with 11.5 percent, followed by business services at eight percent.

Nanhi Singh said the problem is likely to worsen in coming years to the point where such bots would exist everywhere. She urged organizations to introduce bot management and security tools in an effort to limit automated traffic and prevent dangerous account takeovers.