NGL Keynote 4  ·  Unit 11
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Reading & Language

Your Brain
on Nature

Science is discovering what we always felt: time in nature is medicine for the mind.

Lead-in01

When did you last spend time in nature — and how did it make you feel?

South Korea is building forest therapy centers and spending $100 million to bring people back to nature. Science is catching up with what we intuitively know: trees are good for us. But most of us are spending less time outdoors than ever before.

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Forest healing
Korea's therapy forests
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Stress relief
Lower cortisol & BP
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Creativity
50% boost after hiking
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Memory
Better after park walks

Nature isn't just beautiful — it's medicine for the brain. Let's look at the evidence.

Reading02

SKIM THE ARTICLE — 90 SECONDS

WHO
Kang Byoung-wook (firefighter); Lisa Nisbet (psychologist); Richard Ryan; Stephen Kaplan; David Strayer
WHAT
Nature reduces stress, improves memory & attention, boosts creativity, and may prevent disease
HOW / WHY
We evolved in nature; 20 min/day is enough; 3-day wilderness study showed 50% creativity boost

Check your answers above ↑

Reading
Paragraph 1

Firefighter Anecdote

A Korean firefighter's forest therapy session opens the article with a vivid scene.

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SCENE SETTING

After a morning hike in the Saneum Healing Forest east of Seoul, 46-year-old firefighter Kang Byoung-wook sips tea made from the bark of an elm tree, practices yoga, enjoys an arm massage, and makes a collage from dried flowers. He is one of about 40 firefighters taking part in a three-day program sponsored by the local government. The aim of the program is to offer "forest healing"; the firefighters all have posttraumatic stress disorder.
Using polysyndeton (repeated "and") and a detailed list slows the reader down, mirroring the relaxed, therapeutic pace of the forest session itself — a contrast to the PTSD sufferers' stressful daily lives.
Reading04

PROGRAM PURPOSE

After a morning hike in the Saneum Healing Forest east of Seoul, 46-year-old firefighter Kang Byoung-wook sips tea made from the bark of an elm tree, practices yoga, enjoys an arm massage, and makes a collage from dried flowers. He is one of about 40 firefighters taking part in a three-day program sponsored by the local government. The aim of the program is to offer "forest healing"; the firefighters all have posttraumatic stress disorder.
It signals that official, institutional support backs forest therapy — this isn't a fringe idea but a government-funded program, adding credibility and preparing the reader for South Korea's larger investment discussed next.
Reading05

FOREST HEALING DEFINED

After a morning hike in the Saneum Healing Forest east of Seoul, 46-year-old firefighter Kang Byoung-wook sips tea made from the bark of an elm tree, practices yoga, enjoys an arm massage, and makes a collage from dried flowers. He is one of about 40 firefighters taking part in a three-day program sponsored by the local government. The aim of the program is to offer "forest healing"; the firefighters all have posttraumatic stress disorder.
The semicolon creates a tight causal link without spelling it out — it implies that PTSD is precisely why forest healing is needed. This understated juxtaposition is more powerful than writing "because they all have PTSD."
Reading
Paragraph 2

South Korea's Investment

A nation-wide embrace of nature therapy backed by money and policy.

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EXPANSION PLANS

Saneum is one of three official healing forests in South Korea, which offer a range of programs from meditation to woodcraft to camping. Soon there will be 34 more. South Koreans—many of whom suffer from work stress, digital addiction, and intense academic pressures—have embraced the medicalization of nature with great enthusiasm. In fact, Korea's Chungbuk University offers a "forest healing" degree program, and the government is investing a hundred million dollars in a healing complex next to Sobaeksan National Park.
The three-point span (mental → hands-on craft → outdoor living) suggests programs cover a wide spectrum, from reflective to physical activities — demonstrating a holistic approach to healing through nature.
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SHORT SENTENCE IMPACT

Saneum is one of three official healing forests in South Korea, which offer a range of programs from meditation to woodcraft to camping. Soon there will be 34 more. South Koreans—many of whom suffer from work stress, digital addiction, and intense academic pressures—have embraced the medicalization of nature with great enthusiasm. In fact, Korea's Chungbuk University offers a "forest healing" degree program, and the government is investing a hundred million dollars in a healing complex next to Sobaeksan National Park.
The four-word sentence ("Soon there will be 34 more") creates a dramatic pause after the detailed first sentence. Its brevity amplifies the scale of the expansion — the contrast in sentence length mirrors the contrast between what exists now and what is coming.
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SOCIAL CONTEXT

Saneum is one of three official healing forests in South Korea, which offer a range of programs from meditation to woodcraft to camping. Soon there will be 34 more. South Koreans—many of whom suffer from work stress, digital addiction, and intense academic pressures—have embraced the medicalization of nature with great enthusiasm. In fact, Korea's Chungbuk University offers a "forest healing" degree program, and the government is investing a hundred million dollars in a healing complex next to Sobaeksan National Park.
The non-restrictive clause (many of whom…) provides the causal reason for South Korea's enthusiasm — without it, the embrace seems random. It also universalizes the problem: these modern stressors exist everywhere, not just Korea.
Reading09

ACADEMIC + FINANCIAL COMMITMENT

Saneum is one of three official healing forests in South Korea, which offer a range of programs from meditation to woodcraft to camping. Soon there will be 34 more. South Koreans—many of whom suffer from work stress, digital addiction, and intense academic pressures—have embraced the medicalization of nature with great enthusiasm. In fact, Korea's Chungbuk University offers a "forest healing" degree program, and the government is investing a hundred million dollars in a healing complex next to Sobaeksan National Park.
Spelling out "a hundred million dollars" in words slows the reader and makes the figure feel more weighty and deliberate. It also pairs with "In fact" — the phrase signals that what follows will surprise or impress the reader.
Reading
Paragraph 3

Modern Disconnection

Evidence grows as we spend less time outdoors — the paradox of our time.

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EVIDENCE GROWING

There is increasing evidence that being outside in a pleasant natural environment is good for us. But how many of us get to enjoy nature regularly? Fewer and fewer, it seems. According to Lisa Nisbet, a psychology professor at Canada's Trent University, evidence for the benefits of nature is pouring in at a time when we are most disconnected from it. The pressures of modern life lead to long hours spent working indoors. Digital addiction and strong academic pressure add to the problem.
The noun clause ("that being outside…") acts as a postmodifier of "evidence," specifying what kind of evidence. The gerund "being outside" as its subject turns a state into an ongoing activity — implying we must actively choose it.
Reading11

RHETORICAL QUESTION

There is increasing evidence that being outside in a pleasant natural environment is good for us. But how many of us get to enjoy nature regularly? Fewer and fewer, it seems. According to Lisa Nisbet, a psychology professor at Canada's Trent University, evidence for the benefits of nature is pouring in at a time when we are most disconnected from it. The pressures of modern life lead to long hours spent working indoors. Digital addiction and strong academic pressure add to the problem.
The rhetorical question invites readers to self-reflect — it makes the issue personal before the statistics arrive. It also creates a pivot: the paragraph turns from "evidence is good" to "but we're not using it."
Reading12

FRAGMENT FOR EFFECT

There is increasing evidence that being outside in a pleasant natural environment is good for us. But how many of us get to enjoy nature regularly? Fewer and fewer, it seems. According to Lisa Nisbet, a psychology professor at Canada's Trent University, evidence for the benefits of nature is pouring in at a time when we are most disconnected from it. The pressures of modern life lead to long hours spent working indoors. Digital addiction and strong academic pressure add to the problem.
It is a sentence fragment — a subject without a main verb. The phrase "it seems" adds hedging uncertainty. Together, the fragmented, wistful structure enacts the decline it describes: something is missing, just as nature is missing from modern life.
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NISBET'S PARADOX

There is increasing evidence that being outside in a pleasant natural environment is good for us. But how many of us get to enjoy nature regularly? Fewer and fewer, it seems. According to Lisa Nisbet, a psychology professor at Canada's Trent University, evidence for the benefits of nature is pouring in at a time when we are most disconnected from it. The pressures of modern life lead to long hours spent working indoors. Digital addiction and strong academic pressure add to the problem.
The irony: we know most about nature's benefits precisely when we are furthest from it. "Pouring in" is a flood metaphor — research is abundant and unstoppable, yet the actual time in nature is drying up. The contrast in images reinforces the paradox.
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MODERN BARRIERS

There is increasing evidence that being outside in a pleasant natural environment is good for us. But how many of us get to enjoy nature regularly? Fewer and fewer, it seems. According to Lisa Nisbet, a psychology professor at Canada's Trent University, evidence for the benefits of nature is pouring in at a time when we are most disconnected from it. The pressures of modern life lead to long hours spent working indoors. Digital addiction and strong academic pressure add to the problem.
"Lead to" constructs a causal chain: pressure → indoor hours → disconnection from nature. It frames the problem as systemic, not personal — people aren't choosing to avoid nature; they are driven away by structural forces.
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CUMULATIVE PROBLEMS

There is increasing evidence that being outside in a pleasant natural environment is good for us. But how many of us get to enjoy nature regularly? Fewer and fewer, it seems. According to Lisa Nisbet, a psychology professor at Canada's Trent University, evidence for the benefits of nature is pouring in at a time when we are most disconnected from it. The pressures of modern life lead to long hours spent working indoors. Digital addiction and strong academic pressure add to the problem.
"Add to the problem" treats disconnection as an already-established problem (referencing the previous sentence), so this sentence builds on momentum rather than starting over. It creates a sense of compounding factors — the situation keeps getting worse.
Reading
Paragraph 4

Health Benefits

From calming stress hormones to lowering disease rates — nature heals the body.

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OBVIOUS EFFECT

So what are some of the benefits of nature that Nisbet refers to? Being surrounded by nature has one obvious effect: It calms us and reduces our stress levels. This has been shown to lower blood pressure, heart rates, and levels of the stress hormone cortisol, as well as reduce feelings of fear or anger. But studies also indicate that spending time in nature can do more than provide an improved sense of well-being; it can lower rates of heart disease, asthma, and diabetes. This is probably because we evolved in nature and are adapted to understanding its signs.
The colon signals that what follows is the definition or specification of the "obvious effect." It builds a moment of anticipation — and then delivers a simple, direct answer ("It calms us"), making the phrasing feel precise and authoritative.
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PHYSICAL EVIDENCE

So what are some of the benefits of nature that Nisbet refers to? Being surrounded by nature has one obvious effect: It calms us and reduces our stress levels. This has been shown to lower blood pressure, heart rates, and levels of the stress hormone cortisol, as well as reduce feelings of fear or anger. But studies also indicate that spending time in nature can do more than provide an improved sense of well-being; it can lower rates of heart disease, asthma, and diabetes. This is probably because we evolved in nature and are adapted to understanding its signs.
The list moves from measurable physical metrics (BP, heart rate) to biochemical markers (cortisol) to emotional states (fear, anger). This ascending scope — body → chemistry → emotion — shows nature's benefits operate at every level of our being.
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BEYOND WELL-BEING

So what are some of the benefits of nature that Nisbet refers to? Being surrounded by nature has one obvious effect: It calms us and reduces our stress levels. This has been shown to lower blood pressure, heart rates, and levels of the stress hormone cortisol, as well as reduce feelings of fear or anger. But studies also indicate that spending time in nature can do more than provide an improved sense of well-being; it can lower rates of heart disease, asthma, and diabetes. This is probably because we evolved in nature and are adapted to understanding its signs.
"Do more than" sets up a concession-plus-expansion structure: the reader expects a modest claim (feeling better), then is surprised by the stronger claim (preventing disease). The semicolon reinforces this by presenting both as equal but separate claims.
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EVOLUTIONARY EXPLANATION

So what are some of the benefits of nature that Nisbet refers to? Being surrounded by nature has one obvious effect: It calms us and reduces our stress levels. This has been shown to lower blood pressure, heart rates, and levels of the stress hormone cortisol, as well as reduce feelings of fear or anger. But studies also indicate that spending time in nature can do more than provide an improved sense of well-being; it can lower rates of heart disease, asthma, and diabetes. This is probably because we evolved in nature and are adapted to understanding its signs.
"Probably" signals epistemic uncertainty — the writer is giving a plausible explanation, not a proven fact. This is characteristic of responsible science writing: distinguishing between observed effects (proven) and causal mechanisms (still inferred). It builds intellectual honesty.
Reading
Paragraph 5

Energy & Happiness

Twenty minutes a day can make a significant difference.

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VITALITY EFFECT

Spending time outdoors also makes us happier and can lead to a boost of energy — a sense of being more alive. Just 20 minutes a day in nature is enough to make a significant difference. "Nature is fuel for the soul," says psychology professor Richard Ryan.
The appositive dash redefines "boost of energy" in experiential terms — not just physical energy but an existential aliveness. This moves from measurable (energy) to felt quality (vitality), making the benefit feel more profound and human.
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MINIMUM DOSE

Spending time outdoors also makes us happier and can lead to a boost of energy — a sense of being more alive. Just 20 minutes a day in nature is enough to make a significant difference. "Nature is fuel for the soul," says psychology professor Richard Ryan.
"Just" is a minimizer adverb — it signals that the threshold is surprisingly low, removing any excuse not to try. Without "just," the sentence is factual; with it, the writer is challenging the reader to act.
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METAPHOR: FUEL FOR THE SOUL

Spending time outdoors also makes us happier and can lead to a boost of energy — a sense of being more alive. Just 20 minutes a day in nature is enough to make a significant difference. "Nature is fuel for the soul," says psychology professor Richard Ryan.
It is an aphorism — a short, memorable metaphor that compresses a complex idea. "Fuel" frames nature as a necessity, not a luxury (you need fuel to function). Attributing it to a professor gives it authority while the metaphorical language makes it emotionally resonant.
Reading
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Kaplan: Attention Study

A park walk beats a city walk for memory and focus.

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KAPLAN'S FINDING

Another experiment conducted by psychologist Stephen Kaplan and his colleagues found that people who took a 50-minute walk in a park had better attention and short-term memory than those who took a walk along a city street. "Imagine a therapy that had no known side effects, was readily available, and could improve your cognitive functioning at zero cost," the researchers wrote in their paper. "It exists," they continued, "and it's called 'interacting with nature.'"
The comparative clause signals a controlled experiment — there was a comparison group (city walkers), making the result scientifically valid rather than anecdotal. This shifts the article from personal testimony to empirical evidence.
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IRONIC PITCH

Another experiment conducted by psychologist Stephen Kaplan and his colleagues found that people who took a 50-minute walk in a park had better attention and short-term memory than those who took a walk along a city street. "Imagine a therapy that had no known side effects, was readily available, and could improve your cognitive functioning at zero cost," the researchers wrote in their paper. "It exists," they continued, "and it's called 'interacting with nature.'"
The researchers use an advertising pitch structure — listing appealing features before revealing the product. The imperatives ("Imagine") draw readers in. By describing nature as a miracle drug, they expose the irony of our neglect: this therapy exists and is free.
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THE PUNCHLINE

Another experiment conducted by psychologist Stephen Kaplan and his colleagues found that people who took a 50-minute walk in a park had better attention and short-term memory than those who took a walk along a city street. "Imagine a therapy that had no known side effects, was readily available, and could improve your cognitive functioning at zero cost," the researchers wrote in their paper. "It exists," they continued, "and it's called 'interacting with nature.'"
The two-word sentence "It exists" creates a dramatic pause between the setup and the reveal. It heightens anticipation and imitates the structure of a joke or dramatic reveal — the reader knows the answer is coming but must wait for it, maximizing the rhetorical impact.
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Nature & Creativity

Three days in the wilderness boosts creative problem-solving by 50%.

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THE SURPRISING FINDING

Perhaps what's more surprising is that nature may also make us more creative. David Strayer, a cognitive psychologist at the University of Utah, demonstrated as much with a group of participants, who performed 50 percent better on creative problem-solving tasks after three days of wilderness backpacking. When we slow down, stop the busywork, and take in beautiful natural surroundings, he says, not only do we feel restored, but our mental performance improves too.
"What's more surprising" is a fused relative clause (= "the thing that is more surprising") functioning as the subject of the sentence. It signals a hierarchy of surprises — creativity beats all previous benefits in unexpectedness, preparing the reader for a claim that goes beyond physical health.
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STRAYER'S EXPERIMENT

Perhaps what's more surprising is that nature may also make us more creative. David Strayer, a cognitive psychologist at the University of Utah, demonstrated as much with a group of participants, who performed 50 percent better on creative problem-solving tasks after three days of wilderness backpacking. When we slow down, stop the busywork, and take in beautiful natural surroundings, he says, not only do we feel restored, but our mental performance improves too.
"Demonstrated as much" uses anaphoric reference ("as much" = the creativity claim), creating cohesion across sentences. It avoids repetition and signals that evidence follows an already-made claim — a classic academic writing move that separates assertion from proof.
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NOT ONLY… BUT ALSO

Perhaps what's more surprising is that nature may also make us more creative. David Strayer, a cognitive psychologist at the University of Utah, demonstrated as much with a group of participants, who performed 50 percent better on creative problem-solving tasks after three days of wilderness backpacking. When we slow down, stop the busywork, and take in beautiful natural surroundings, he says, not only do we feel restored, but our mental performance improves too.
The correlative conjunction "not only… but" creates an additive climax: the second element (mental performance) is presented as more than expected. Placing "he says" mid-sentence as a parenthetical reporting clause keeps the quote embedded within the analysis without breaking flow.
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Conclusion

We are beginning to understand — but mystery remains.

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INTUITION CONFIRMED

We all intuitively know that nature is good for us. Now we are beginning to understand the many ways it benefits us and just what effects it has on the mind and body. According to Strayer, we may never know exactly what nature does to the brain. Something mysterious will always remain, and maybe that's as it should be.
"Intuitively" frames prior knowledge as pre-scientific. The word prepares a movement from gut feeling → science → mystery, suggesting that science confirms but cannot fully explain what we already feel. The paragraph thus ends on wonder, not certainty.
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SCIENCE CATCHING UP

We all intuitively know that nature is good for us. Now we are beginning to understand the many ways it benefits us and just what effects it has on the mind and body. According to Strayer, we may never know exactly what nature does to the brain. Something mysterious will always remain, and maybe that's as it should be.
"Beginning" signals early-stage knowledge — the research is ongoing, not complete. This is intellectually honest but also creates a sense of exciting discovery. It pairs with "may never know" later to frame science as a continuous journey rather than a destination.
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LIMITS OF SCIENCE

We all intuitively know that nature is good for us. Now we are beginning to understand the many ways it benefits us and just what effects it has on the mind and body. According to Strayer, we may never know exactly what nature does to the brain. Something mysterious will always remain, and maybe that's as it should be.
"May never know" is permanent epistemic limitation — not a temporary gap but a fundamental mystery. "Do not yet know" implies it's solvable with more research. Strayer's phrasing elevates nature to something beyond full scientific capture, preparing the philosophical ending.
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EMBRACING MYSTERY

We all intuitively know that nature is good for us. Now we are beginning to understand the many ways it benefits us and just what effects it has on the mind and body. According to Strayer, we may never know exactly what nature does to the brain. Something mysterious will always remain, and maybe that's as it should be. "At the end of the day," he says, "we come out in nature not because the science says it does something to us, but because of how it makes us feel."
The phrase accepts permanent mystery rather than demanding explanation. The modal "maybe" is deliberately tentative, and "as it should be" implies mystery is not a flaw but a natural condition. This suggests the author values wonder and humility over scientific completeness.
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FEELING OVER SCIENCE

We all intuitively know that nature is good for us. Now we are beginning to understand the many ways it benefits us and just what effects it has on the mind and body. According to Strayer, we may never know exactly what nature does to the brain. Something mysterious will always remain, and maybe that's as it should be. "At the end of the day," he says, "we come out in nature not because the science says it does something to us, but because of how it makes us feel."
The not…because X, but because Y structure explicitly places feeling above science as the ultimate motivation. The article opened with science proving nature works; it closes with a scientist saying science is beside the point. This creates a full circular resolution — we return to intuition.
Language34

Noun Clauses as Subjects

Using "what" + clause as the grammatical subject for emphasis

what-clause subject position it… that construction fronting
A) "Perhaps what's more surprising is that nature may also make us more creative." B) "What we need is not more data, but more time outdoors." (original) C) ❌ "Perhaps the more surprising thing that is nature makes us creative." (awkward) D) RULE: A "what-clause" (what + S + V) as the subject creates EMPHASIS — the writer highlights the claim as noteworthy BEFORE stating it. Compare: "It is surprising that..." (less direct) vs "What is surprising is that..." (more impactful).
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Hedging: seems / appears / is likely to

Expressing degrees of certainty in academic and science writing

epistemic modality hedging language probably / perhaps seems to
A) "This is probably because we evolved in nature." / "Fewer and fewer, it seems." B) CERTAINTY SCALE: definitely → probably → seems → may → might → possibly C) ❌ "This is because we evolved in nature." (over-claims; removes intellectual honesty) D) RULE: HEDGING shows the writer distinguishes OBSERVED FACTS (shown, demonstrated, found) from INFERRED CAUSES (probably, seems, may). In science writing, this is not weakness — it is accuracy and intellectual responsibility.
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Metaphorical Language in Science Writing

How metaphors make abstract research vivid and persuasive

metaphor vehicle / tenor emotional resonance aphorism
A) "Nature is fuel for the soul." / Evidence is "pouring in." / Interacting with nature as "therapy." B) LITERAL equivalents: "Nature has beneficial effects." / "Research is accumulating." / "Nature improves cognition." C) ❌ The literal versions are accurate but FORGETTABLE — they carry no emotional weight. D) RULE: Metaphor in science writing serves two functions: (1) ACCESSIBILITY — it translates data into lived experience; (2) PERSUASION — it makes the reader feel the truth, not just understand it. "Fuel for the soul" implies nature is a NECESSITY, not an option.
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Lesson Complete — Unit 11

Forest Therapy

South Korea invests $100M in healing forests for stress, PTSD, and well-being

Science Says

Nature lowers cortisol, BP, heart rate — and may prevent heart disease & diabetes

Brain on Nature

Park walks improve attention; 3-day hikes boost creativity by 50%

The Mystery

Science can't fully explain it — and maybe it shouldn't have to

Nature is fuel for the soul.