It’s a fascinating question that intrigues millions of pet owners, animal lovers, veterinarians and scientists all over the world: Just how smart are animals?
Scientists once believed a brain with billions of neurons was a requirement for intelligence. After all, that’s why you’re able to think – neurons are the nerve cells in the brain that connect and transmit messages to each other.
Yet the more that scientists like me study animal emotion and cognition – the ability to learn through experiences and thinking – the more we find that humans are not very special at all. Many nonhuman species can do these things too.
Right now, there’s no agreement on how to decide whether a particular animal species is intelligent. But most scientists who study animal cognition have observed that many animals are able to solve problems, use tools, recall important information about their environment and recognize themselves in the mirror.
Measuring an animal’s intelligence is harder than you might think.
That kind of recall – known as episodic memory – is the ability to remember an event, including when and where it occurred. Until recently, scientists thought only humans had it. But now researchers have learned that some birds, cats, rats, monkeys and dolphins have it too.
Crows are among the smartest of animals. Santiago Urquijo/Moment via Getty Images
Animals may not remember every experience – neither do people – but they do recall things critical to their survival. For example, birds know where they stored food. Monkeys know the presence of a predator.
Scientists once thought tool use was an exclusively human ability, but that’s not so. Chimpanzees use sticks to catch termites and stones to crack nuts open. Crows can even manufacture tools. By bending a wire, they can make a hook to retrieve a food reward that’s otherwise out of reach.
Researchers presented eight captive brown bears with this food challenge: Three objects – a large log, a small log and a box – were placed in an outdoor enclosure. A food reward was suspended above them. Six of the eight bears were able to move the logs and box into positions that enabled them to fetch the reward. Essentially, they used the three objects as tools.
Chimps use gestures and facial expressions to communicate.
Dolphin, chimpanzee communication
Language is another measure of intelligence. People, of course, have enormously sophisticated communication skills. But dolphins have complex dialects in the form of crackles, squeaks and whistles. Many researchers say the noises are a language. Chimpanzees and gorillas have used sign language to express emotions and ask for things from people.
Self-awareness – the ability to recognize yourself as an individual – signals intelligence. Babies don’t recognize themselves in the mirror until they are about a year and a half old. Up until then, they probably think the mirror image they see is another baby.
Many other species, including dolphins, ravens and elephants, recognize themselves in the mirror. Researchers put a red dye mark on chimpanzees under anesthesia; once awake, the chimps saw their reflection in a mirror. Instead of touching the red mark on their reflection in the glass, they touched the red mark on themselves, indicating self-recognition.
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Just because animals can’t do certain things, it doesn’t mean they’re unintelligent. After all, humans can’t fly like a bird or swim like a fish. Nor is there a need for us to have the incredible sense of smell a dog has. We’d be sniffing hundreds of different smells from miles away – the scents from perfumes and pollution, gardens and garbage. From an evolutionary standpoint, that wouldn’t help us much. Plus, we’d get sick of it very quickly.
But all animals, including humans, have developed a wide range of capabilities so they can succeed in the environment they live in. Put simply, we’re all using our brains. Now that’s intelligent.
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Currently, getting a yearly COVID-19 vaccine is recommended for everyone ages 6 months and older, regardless of their health risk.
In the video announcing the plan to remove the vaccine from the CDC’s recommended immunization schedule for healthy children and healthy pregnant women, Kennedy spoke alongside National Institutes of Health Director Jay Bhattacharya and FDA Commissioner Marty Makary. The trio cited a lack of evidence to support vaccinating healthy children. They did not explain the reason for the change to the vaccine schedule for pregnant people, who have previously been considered at high-risk for severe COVID-19.
Similarly, in the FDA announcement made a week prior, Makary and the agency’s head of vaccines, Vinay Prasad, said that public health trends now support limiting vaccines to people at high risk of serious illness instead of a universal COVID-19 vaccination strategy.
Was this a controversial decision or a clear consensus?
Many public health experts and professional health care associations have raised concerns about Kennedy’s latest announcement, saying it contradicts studies showing that COVID-19 vaccination benefits pregnant people and children. The American College of Obstetrics and Gynecology, considered the premier professional organization for that medical specialty, reinforced the importance of COVID-19 vaccination during pregnancy, especially to protect infants after birth. Likewise, the American Academy of Pediatrics pointed to the data on hospitalizations of children with COVID-19 during the 2024-to-2025 respiratory virus season as evidence for the importance of vaccination.
Kennedy’s announcement on children and pregnant women comes roughly a month ahead of a planned meeting of the Advisory Committee on Immunization Practices, a panel of vaccine experts that offers guidance to the CDC on vaccine policy. The meeting was set to review guidance for the 2025-to-2026 COVID-19 vaccines. It’s not typical for the CDC to alter its recommendations without input from the committee.
Robert F. Kennedy Jr. has removed COVID-19 vaccines from the vaccine schedule for healthy children and pregnant people.
FDA officials Makary and Prasad also strayed from past established vaccine regulatory processes in announcing the FDA’s new stance on recommendations for healthy people under age 65. Usually, the FDA broadly approves a vaccine based on whether it is safe and effective, and decisions on who should be eligible to receive it are left to the CDC, which bases its decision on the advisory committee’s research-based guidance.
The advisory committee was expected to recommend a risk-based approach for the COVID-19 vaccine, but it was also expected to recommend allowing low-risk people to get annual COVID-19 vaccines if they want to. The CDC’s and FDA’s new policies on the vaccine will likely make it difficult for healthy people to get the vaccine.
Will low-risk people be able to get a COVID-19 shot?
Not automatically. Kennedy’s announcement does not broadly address healthy adults, but under the new FDA framework, healthy adults who wish to receive the fall COVID-19 vaccine will likely face obstacles. Health care providers can administer vaccines “off-label”, but insurance coverage is widely based on FDA recommendations. The new, narrower FDA approval will likely reduce both access to COVID-19 vaccines for the general public and insurance coverage for COVID-19 vaccines.
Under the Affordable Care Act, Medicare, Medicaid and private insurance providers are required to fully cover the cost of any vaccine endorsed by the CDC. Kennedy’s announcement will likely limit insurance coverage for COVID-19 vaccination.
Overall, the move to focus on individual risks and benefits may overlook broader public health benefits. Communities with higher vaccination rates have fewer opportunities to spread the virus.
This is an updated version of an article originally published on May 22, 2025.Libby Richards, Professor of Nursing, Purdue University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
The All-New 2026 Nissan LEAF Is Here — Sleek, Smart, and Ready to Lead
Nissan has officially lifted the curtain on the all-new 2026 LEAF, and it’s not just an update—it’s a total reinvention. The third-generation LEAF blends sleek, aerodynamic styling with SUV-like proportions, signaling a bold departure from the hatchback form that defined the nameplate for over a decade. This refreshed design marks a new chapter for one of the world’s most accessible and best-selling electric vehicles.
With nearly 700,000 global sales under its belt, the LEAF has long been a pioneer in the mass-market EV space. The 2026 model takes that foundation and builds upon it in every direction—design, technology, comfort, and capability. Whether you’re a loyal EV enthusiast or making the switch from a gas-powered car, Nissan’s newest electric offering is designed to meet you where you are and elevate your driving experience.
The all-new LEAF sports clean, sculpted body lines and a wide stance that echoes modern crossover aesthetics. Inside, the cabin is minimal yet inviting, focused on comfort, spaciousness, and wellbeing. A dimming panoramic roof with heat shielding adds a premium touch, while ambient lighting in 64 available colors helps set the perfect mood for any drive.
Performance Meets Practicality
Among the most impressive upgrades is a liquid-cooled lithium-ion battery offering up to 75 kWh of usable capacity—meaning more range, more freedom, and more confidence. Faster charging speeds and the inclusion of the North American Charging Standard (NACS) port with Plug & Charge capability further simplify EV ownership.
Nissan’s all-new 3-in-1 powertrain—a compact, integrated system combining motor, inverter, and reducer—delivers both efficiency and power in a sleek package. It’s an engineering advancement that supports the LEAF’s mission of providing reliable, affordable electric mobility for all.
Tech-Savvy and Feature-Rich
This isn’t just a car—it’s a rolling tech hub. The 2026 LEAF offers dual 14.3-inch displays, wireless Apple CarPlay® and Android Auto™, and Google built-in features like Google Maps. Drivers will enjoy innovative tools like the Invisible Hood View, Front Wide View, and the 3D Intelligent Around View® Monitor—making tight parking and complex driving environments far easier to navigate.
Audiophiles take note: the available Bose® Personal® Plus audio system ensures that your soundtrack is every bit as premium as your ride.
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Built to Impress, Ready for the Road
With details like flush door handles, holographic 3D tail lamps, and available 19-inch wheels, the 2026 LEAF is clearly designed to turn heads. But its mission is practical at heart: making electric driving seamless for everyday users. From its improved range to thoughtful in-cabin tech, Nissan is aiming squarely at the mainstream with this launch.
Assembly for the U.S. and Canadian markets will take place at Nissan’s Tochigi plant in Japan, where the LEAF will be built alongside the Ariya SUV.
The 2026 Nissan LEAF arrives at U.S. dealerships this fall, with availability in other global markets to follow.
Want more 2026 Nissan LEAF details or a feature breakdown?
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The once red-hot U.S. residential solar market is showing signs of cooling off—but don’t count it out just yet. A combination of rising interest rates, regulatory changes, and supply chain challenges have led to a notable dip in installations across the country. But while the short-term trend suggests a slowdown, industry experts remain optimistic about the long-term potential of rooftop solar.
📉 The Numbers Don’t Lie: Installations Are Down
According to the Solar Energy Industries Association (SEIA) and Wood Mackenzie, residential solar installations dropped by 13% year-over-year in Q1 2025, with 1,106 megawatts (MW) installed nationwide. That’s also a 4% decline from the previous quarter. This marks a continuation of the trend that began in 2024, which saw the residential sector contract in 22 states—including a five-year low in California [^1].
Analysts at BloombergNEF predict that total U.S. solar capacity will fall by 7% between 2025 and 2027, with a projected 1% annual decline through 2035 under current policy scenarios [^2].
🧾 What’s Behind the Drop?
1. Higher Interest Rates
The Federal Reserve’s continued efforts to tame inflation have made financing solar systems more expensive for homeowners. The result? Fewer consumers are willing to commit to the upfront investment, even with long-term savings in play [^3].
2. Policy Shifts in Key States
California, long considered the leader in solar adoption, rolled back its Net Energy Metering (NEM) 2.0 program in favor of NEM 3.0, which significantly reduces the value of solar exports back to the grid. Installations in the state fell sharply as a result [^1].
On the federal side, proposed cuts to the 30% Investment Tax Credit (ITC)—a major driver of residential adoption—have caused uncertainty in the market. According to Reuters, solar stocks plummeted following changes in a Senate tax bill that threatened to shrink or eliminate these credits [^4].
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3. Tariffs and Supply Constraints
Tariffs on Chinese and other foreign-made solar panels have led to price increases and reduced availability. Simultaneously, battery storage components are experiencing shortages, further delaying installations and complicating project timelines [^5].
🌤 The Long-Term Picture: A Resilient Future
Despite the headwinds, many in the industry see this as a short-term correction rather than a lasting decline. SEIA projects a return to 9% annual residential growth from 2025 to 2030, particularly if financing conditions improve and federal incentives remain intact [^1].
Additionally, solar panel prices remain historically low, hovering around $2.50–$2.60 per watt installed. That affordability, coupled with increasing demand for home electrification and EV charging solutions, makes rooftop solar an attractive long-term investment [^1].
In a recent industry survey, 78% of solar installers said they expect to sell as much or more in 2025 than they did in 2024 [^3]. And while the market is down in states like California, others—including Texas, Florida, and Arizona—are continuing to grow.
✅ Final Takeaway
Yes, residential solar is currently in a downturn. But it’s more of a recalibration than a collapse. Regulatory turbulence and financial pressures are squeezing the market, but the fundamentals—affordability, environmental benefits, and technological advancement—remain strong.
The future of residential solar will depend heavily on stable policy support, affordable financing, and continued innovation. If those stars align, the industry could see another boom in the latter half of the decade.
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📚 Sources
[^1]: SEIA/Wood Mackenzie. U.S. Solar Market Insight Q1 2025.
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