Unit 3: The Challenge of Alzheimer's

Lead-in 01

Do you know anyone affected by memory loss? 🧓

The world is getting older — and aging brings new challenges. Before reading, consider: what do you know about these issues?

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Aging Population

More elderly than ever before

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Healthcare Cost

Who pays for care?

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Alzheimer's

Memory, behavior, thinking

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Technology

New tools and treatments

This article explores one of the biggest health challenges of an aging world — and a glimpse of hope from science.

Reading 02

Skimming Task ⏱

Read the article quickly (90 seconds). Answer three questions:

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The Problem

What global trend is described?

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The Disease

What is Alzheimer's and what does it affect?

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The Hope

What new technology is being tested?

✅ Problem: Populations are aging — more over-65s than under-5s, straining healthcare. | Disease: Alzheimer's affects memory, behavior and thinking, eventually requiring constant care. | Hope: Australian researchers are using sound waves to clear waste in the brain and restore memory.

Reading 03

HISTORIC MILESTONE

For the first time in history, there are more people above the age of 65 than children below the age of five. As populations grow older, aging societies will begin to face major challenges—such as the provision of healthcare.

Fronting the adverbial phrase creates immediate drama and emphasis. Placing "for the first time in history" at the start signals that something unprecedented is about to be stated — it primes the reader to pay attention. In normal word order, "there are more people above 65 for the first time in history" buries the significance. Fronting it acts like a headline, making the statistic feel remarkable before we even read it.

Reading 04

FUTURE CHALLENGES

"Will begin to face" uses the simple future with modal "will" to describe a predicted, near-certain outcome. The present continuous "are facing" would suggest the challenge is already underway everywhere — "will" positions it as an incoming, forward-looking trend that is gathering momentum. This framing creates urgency: the author is warning us about what is coming, not just describing what is happening right now. It also invites the reader to consider solutions before the crisis peaks.

Reading 05

COST OF CARE

Elderly people have a higher chance of suffering from illnesses such as diabetes, cancer, and heart disease. Providing proper healthcare facilities and treatment is expensive, and the rising cost of healthcare puts a lot of pressure on the working population. In Europe, for example, there are currently four working people supporting one elderly person. By 2050, this number will fall to two workers per elderly person.

Grammatically, "such as" introduces a non-exhaustive list of examples — it signals "these are representative cases, not an exhaustive inventory." Rhetorically, listing three well-known, serious diseases (diabetes, cancer, heart disease) makes the abstract claim ("higher chance of illness") concrete and credible. The triad structure (three items) is also a persuasive pattern — it feels complete and authoritative. If only one example were given, it might seem cherry-picked; three feels balanced and evidence-based.

Reading 06

FINANCIAL PRESSURE

The gerund subject "Providing proper healthcare… is expensive" places the action itself at the forefront — it focuses on the activity rather than anticipating it with a dummy "it." The "It is expensive to…" structure is also grammatical and common, but slightly more conversational. Using a gerund subject is a feature of formal and academic writing because it is more direct and compact. It also foregrounds the concept being discussed (providing care) rather than building up to it, which suits an expository article aimed at informing.

Reading 07

EUROPE AS EXAMPLE

"For example" is a parenthetical discourse marker, set off by commas, placed mid-sentence between the fronted adverbial "In Europe" and the main clause. Its purpose is to signal that what follows is an illustrative instance of the general claim just made (healthcare puts pressure on workers). It moves the argument from the general to the specific, adding credibility. It also invites the reader to generalise back: if this is true in Europe, it is likely true elsewhere. Without it, the European statistic might seem like an isolated data point rather than supporting evidence.

Reading 08

A SHRINKING RATIO

"Will fall" expresses a confident, near-certain prediction — the author treats this as an established demographic forecast, not a mere possibility (which would use "might fall"). "By 2050" is a deadline adverbial — it frames the future as a fixed horizon, making the change feel inevitable and close. Together, they create urgency: the ratio of four workers to one elderly person (already stated as the present reality) will be cut in half within a single generation. The precision of "2050" anchors the abstract prediction in measurable reality, compelling the reader to take the issue seriously.

Reading 09

DEFINING DEMENTIA

One common health problem that affects elderly people is Alzheimer's disease. Alzheimer's—the most common type of dementia—affects a person's memory, behavior, and thinking. Because of memory loss and behavioral changes, people with Alzheimer's may slowly become unable to take care of themselves, eventually requiring constant care from family members or caregivers.

The original sentence uses a presentative structure ("One common health problem… is X") that first introduces the category ("a common health problem") and then reveals the specific topic ("Alzheimer's disease"). This is a classic topic-introduction technique in expository writing: it situates the new concept within a known category before naming it, which helps readers build their mental schema. The alternative ("Alzheimer's disease is a common health problem") simply states a fact and feels less structured as an introduction. The original also connects to the previous paragraph about elderly health challenges, maintaining discourse cohesion.

Reading 10

THREE-WAY IMPACT

The parenthetical remark "the most common type of dementia" adds a definitional gloss — it tells readers where Alzheimer's sits within the broader category of dementia. Using em dashes (—) signals that the information is supplementary but important: it can be removed without breaking the sentence, yet the author deems it useful enough to insert mid-stream. A separate sentence ("Alzheimer's is the most common type of dementia. It affects…") would be choppier and slow the paragraph's pace. The dash insertion keeps the sentence flowing while adding precision, a technique common in informational prose.

Reading 11

GRADUAL LOSS OF INDEPENDENCE

"May" is a modal of possibility/probability — it acknowledges that not every patient will follow the same path (some may deteriorate faster, some slower). "Slowly" is a manner adverb indicating gradual onset — the change is not sudden. "Eventually" is a time adverb indicating endpoint — it will arrive, but not immediately. Together these three words paint a picture of a long, uncertain, and progressive decline, which is clinically accurate for Alzheimer's. This language is not alarmist; it is measured and humane, acknowledging individual variation while conveying the serious trajectory of the disease.

Reading 12

NO CURE — YET

There is no cure for Alzheimer's at the moment—drugs can only treat its symptoms. But technology can improve the lives of those living with the condition by making it easier for them to go about their daily activities. For example, tracking devices placed in watches or jewelry can monitor where a person is. Automated reminders can also be stored in motion sensors and placed around the house. When a sensor detects movement, it can play a recorded voice message to remind the person to lock the door or turn off the stove.

"Only" restricts the scope of what drugs can do — they cannot cure the disease, only manage what it produces. The implicit contrast is between "treating symptoms" (what is possible now) and "curing the disease" (what is not yet possible). This restriction signals a gap in medical capability, and that gap is precisely what motivates the rest of the article — the search for better solutions. The em-dash before this clause also creates a rhetorical pause, as if the author is lowering expectations before building hope in the sentences that follow.

Reading 13

TECHNOLOGY AS AID

Opening with "But" after the negative statement ("no cure… can only treat symptoms") is a classic pivot in argumentative structure: concession followed by redirection. The author acknowledges the limitation of medicine before turning to a hopeful alternative (technology). This "yes, but…" structure is rhetorically effective because it validates the reader's concern while offering a new perspective. Starting a sentence with "but" is permissible in modern prose — it creates a sharper, more immediate contrast than "However" or "Nevertheless", giving the rebuttal more energy and forward momentum.

Reading 14

TRACKING DEVICES

Full form: "Tracking devices that are placed in watches or jewelry can monitor where a person is."
Reducing the relative clause by omitting "that are" creates a denser, more compact sentence — a feature of formal, informational prose. It keeps the sentence from feeling too wordy. The reduced form also places "placed in watches or jewelry" closer to the noun it modifies, improving clarity. This kind of participial post-modifier ("placed in…") is common in academic and journalistic writing to pack information efficiently without slowing the prose.

Reading 15

SMART REMINDERS

The passive voice ("can be stored… and placed") is chosen because the agent (who does the storing/placing) is unimportant or unknown — what matters is the capability and the result. Using "you can store" would imply a specific person taking action, which is less relevant in a general informational context. The passive keeps the focus on the technology itself, not on who operates it. In scientific and technological writing, passive voice is standard for describing systems and processes because it foregrounds the mechanism, not the human actor.

Reading 16

CONDITIONAL TRIGGER

"When" here functions as a conditional-temporal conjunction — it indicates that the detection of movement is the trigger event. Unlike "if" (which implies uncertainty — the movement may or may not happen), "when" implies expectation or predictability: movement is assumed to occur regularly, so the sensor will reliably be triggered. In the context of a person with Alzheimer's going about daily activities, movement is expected — "when" correctly implies that the technology will activate in real use conditions. "If" would suggest the trigger is hypothetical or uncertain, which would undermine the device's presented reliability.

Reading 17

A HUGE CHALLENGE

Alzheimer's disease is a huge challenge, but we may be getting close to finding a solution. In the future, it might be possible to treat Alzheimer's without using drugs. A team of researchers in Australia has created a form of technology that can send sound waves into the brain. These sound waves help to clear waste in the brain that contributes to Alzheimer's. The team has tested their technology and found that it helped to restore memory in 75 percent of mice. Work on the technology isn't complete, but, if successful, it could prevent memory loss in people with Alzheimer's. "I think this really does fundamentally change our understanding of how to treat this disease," says Professor Jürgen Götz, a co-author of the study, "and I foresee a great future for this approach."

"May" expresses epistemic possibility — the author cannot yet make a definitive claim. "Are getting" uses the present continuous to show an ongoing, in-progress movement towards a goal. Together, "may be getting close" conveys cautious optimism: progress is being made now, but a breakthrough is not yet guaranteed. This is scientifically responsible language — it acknowledges real forward movement without over-promising. It contrasts purposefully with the certainty of "will fall" in the earlier paragraph about demographics, signalling that social challenges are predictable but scientific breakthroughs are less so.

Reading 18

DRUG-FREE FUTURE

In this passage, the modals form a scale of epistemic certainty:
"May" (sentence 1) — possible, some evidence
"Might" (sentence 2) — possible but less certain, further in the future
"Could" (sentence 6) — conditional possibility (dependent on "if successful")

The author uses all three to calibrate the reader's expectations at different levels: the general direction is hopeful ("may"), but specific claims are more tentative ("might"), and the ultimate clinical application is conditional ("could"). This layered modality reflects responsible scientific writing — it avoids both false certainty and undue pessimism. Each modal is matched to the degree of evidence available at that point in the argument.

Reading 19

THE AUSTRALIAN BREAKTHROUGH

"Team" is a collective noun treated as singular in American and most modern English usage — hence "has created" (not "have created"). This choice foregrounds the group as a unified actor. Present perfect "has created" links the past action to the present: the technology was invented in the past, but it still exists and is still relevant today. This tense signals that the creation is an ongoing achievement — not a historical footnote. It also implies the research is current, which builds the reader's confidence that a treatment could be near.

Reading 20

HOW SOUND WAVES WORK

The relative clause "that contributes to Alzheimer's" modifies "waste" — it specifies that this is not ordinary cellular debris but the particular toxic build-up (such as amyloid plaques) associated with Alzheimer's disease. Without this clause, "clear waste in the brain" might sound like a general cleaning process. The relative clause makes the claim precise and medically relevant: the sound waves target the specific pathological material that drives Alzheimer's progression. This is an example of how a post-modifier relative clause carries crucial technical information in a compact form.

Reading 21

MOUSE TRIAL RESULTS

Present perfect "has tested" links the past action to the present — the team conducted tests, and those tests are part of the ongoing research effort that still matters today. Simple past "helped" refers to the specific, completed result of those trials — the 75% figure came from a discrete experiment at a fixed point in time. When a past action is reported inside a "found that…" clause, simple past is used because it is now a completed, reported finding. This tense precision is a hallmark of academic and scientific writing: the research process is current (present perfect), but each individual result is historical (simple past).

Reading 22

EVIDENCE AND HOPE

"If successful" is a reduced conditional adverbial clause (short for "if it is successful") inserted mid-sentence as a parenthetical. The two commas signal that it is non-restrictive and interruptive — if you remove it, the core sentence ("Work isn't complete, but it could prevent memory loss") still makes grammatical sense. Both commas are required: the first separates the conditional from the preceding "but", and the second signals the return to the main clause. Without both commas, the sentence becomes ambiguous. This kind of embedded conditional is a concise way to hedge a prediction without writing a full "if… then…" sentence.

Reading 23

THE SCIENTIST'S VISION

Ending with a direct quote is a classic journalistic technique: it gives the final word to an authoritative voice (a named professor and co-author), which lends credibility and emotional resonance. The professor's words "fundamentally change our understanding" express genuine excitement — a tone that is harder for the journalist to adopt in their own voice without seeming biased. The direct quote also adds specificity and authenticity: we hear a real scientist speak. Crucially, ending with "I foresee a great future for this approach" leaves the reader on a note of qualified optimism — echoing the article's careful but hopeful tone throughout.

Language 24

Modals of Possibility & Certainty

Choose the right modal to express your level of certainty.

A) We may be getting close to finding a solution.
   → present evidence suggests it is possible

B) It might be possible to treat Alzheimer's without drugs.
   → future speculation, less certain than "may"

C) It could prevent memory loss — if successful.
   → conditional possibility (depends on further success)

D) RULE: may > might > could (certainty from high → low in this context)

Classify each sentence: may might could
Then explain: why does the article use all three in one paragraph?

A — "may": Present possibility backed by current evidence. The research is actively under way, so "may" signals it is a real, plausible pathway — not just a dream.

B — "might": Slightly more remote than "may" — used for a future scenario that requires more steps to materialise (drug-free treatment). The author is more cautious here.

C — "could": Conditional possibility — the prevention of memory loss depends entirely on further success ("if successful"). Without that condition, "could" is too uncertain to use alone.

Why all three? The author calibrates scientific claims carefully. Using the same modal for every claim would either over-promise or under-promise. The gradient of modals mirrors the gradient of evidence, making the writing scientifically responsible and rhetorically trustworthy.

Language 25

Present Perfect vs. Simple Past

Both tenses refer to the past — but their relationship to the present is different.

A) A team of researchers has created a form of technology.
→ past action, still relevant now (the tech exists today)

B) The team found that it helped to restore memory.
→ specific completed experiment, fixed point in the past

C) ❌ The team created a technology. (implies it's over, no link to now)

D) RULE: Use present perfect for past actions with present relevance; simple past for completed events at a specific time.

Test: add "in 2024" to sentence A. Does it still work with present perfect?
present perfect simple past time adverbials

Test result: "A team has created a technology in 2024" — ❌ WRONG. A specific past time adverb (in 2024, last year, yesterday) forces simple past: "A team created a technology in 2024." ✅

Why "has created" works without the date: Present perfect says "this is done, and it matters now" — it keeps the focus on the present significance of the action rather than its moment of occurrence.

Practical rule: If you can answer "when exactly?", use simple past. If the answer is "it happened, and it's still true/relevant", use present perfect. In academic and scientific writing, present perfect is used to describe the current state of research; simple past is used to narrate specific experiments or findings.

Language 26

Concession + Result: "but" & "if"

A powerful pattern for acknowledging problems while pivoting to solutions.

A) There is no cure but technology can improve lives.
   → adversative conjunction: concede → redirect

B) Work isn't complete, but, if successful, it could prevent memory loss.
   → concession + conditional hedge

C) ❌ Work isn't complete, however if successful it could prevent memory loss.
   → "however" needs a semicolon or new sentence; "but" is leaner

D) RULE: but pivots within a sentence; however/nevertheless link across sentences or clauses with stronger pause.

Rewrite: "There is no cure. Technology can help." — combine using "but".
but however if successful

Rewrite: "There is no cure, but technology can help." ✅

Why "but" is better than "however" here: "However" is a conjunctive adverb — it typically links full sentences (with a semicolon or at the start of a new sentence). "But" is a coordinating conjunction — it directly joins two clauses within one sentence, creating a tighter, more immediate contrast. In journalistic prose, "but" at the start of a sentence creates punch; "however" creates formality. Both are correct in different registers.

The "if successful" hedge: Adding a conditional clause ("if successful, it could…") is a key feature of scientific writing. It signals that the writer is not overstating the evidence — the positive outcome is real but contingent. In your own writing, use "if + successful/correct/proven + could/might" to qualify predictions honestly.

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LESSON COMPLETE

The Challenge of Alzheimer's

Aging populations create major healthcare pressure

Alzheimer's affects memory, behavior, and thinking

Smart technology helps people live more independently

Sound-wave research may restore memory without drugs

I foresee a great future for this approach.

— Professor Jürgen Götz, University of Queensland