theSIGNAL SCIENCE
1 November 2026
"The best way to predict the future is to study the signals the present is already sending."
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Science

A Drop of Blood Forecasts Memory Loss

A protein measured in a routine blood sample may reveal who will develop cognitive impairment, years before memory begins to fail.

Imagine a sixty-eight-year-old who forgets nothing. She remembers birthdays, bus routes, the name of every grandchild's teacher. Yet a vial of her blood might already be hinting at a future she cannot feel. Could that be true?

A large international study suggests it could. Led by the Mass General Brigham Neuroscience Institute, researchers pooled data from six studies and trials in North America, Japan and Australia. Together they followed 2,684 older adults who showed no cognitive impairment at the start. Each person gave a blood sample, which was analysed for a protein called phosphorylated tau 217, or p-tau217.

Each also had a PET brain scan, and annual check-ups tracked memory and thinking. Some participants joined as early as 2004; the latest follow-ups took place in 2025. The pattern was striking. About 478 people eventually developed impairment, and higher p-tau217 levels at the start were strongly linked to that outcome.

Photo: Testalize.me / Unsplash
A technician handles a blood sample in a laboratory where biomarkers linked to Alzheimer's disease are measured.
Discuss
  • Would you want to know your ten-year risk of cognitive impairment if no treatment could prevent it?
  • Why might the ten-year estimate be less reliable than the five-year estimate in this study?
  • How could combining studies from North America, Japan and Australia make the findings stronger than a single study?
Science

The Forgotten Particle That May Explain Everything

Why is there something rather than nothing? Matter and antimatter were born in nearly equal amounts, and they destroy each other on contact. Yet here we are. Physicists in Southampton and Kanpur now point to a neglected suspect: a hypothetical heavy neutrino that decays extremely slowly. It may have briefly ruled the young cosmos, tilting the balance toward matter.…
  • If a neglected particle explains our existence, what else might physics have wrongly dismissed as irrelevant?
∞
A simple blood test could help identify people at increased risk of Alzheimer's-related cognitive decline years before they notice any problems.
Mass General Brigham Neuroscience Institute research team
Science

Tiny Oxygen Collisions Brew Big Bang Soup

Could something as small as an oxygen nucleus cook up the matter of the infant universe? At Brookhaven in New York, the STAR team says yes. Fast particle streams, called jets, lost energy inside the debris, a telltale sign of quark-gluon plasma. CERN's collider in Europe had seen similar hints. Yet RHIC's collisions were far gentler, so the result sets a new lower limit.…
  • How small can a collision be and still recreate the early universe?
EUROPE · Science
Physicists created a tiny universe and watched time emerge without a clock
GLOBAL · Science
Hubble reveals a stunning twist in how the universe emerged from darkness
MIDDLE EAST · Science
A 700,000-year-old elephant tooth reveals a lost world where early humans lived
AFRICA · Science
A mysterious 4,000-year-old wall is rewriting North Africa’s history
theSIGNAL IN THE LAB
1VOCABULARY
pooled datacognitive impairment
caveatstrikingrests on
neglected suspecttelltale sign
2GRAMMAR FOCUS
Relative clauses — defining vs non-defining with commas
A defining relative clause identifies which person or thing we mean and has no commas, so 'that' can replace 'who' or 'which'. A non-defining clause adds extra information, is separated by commas, and cannot use 'that'.
who · which · that · whose · where · when · whom
  1. The researchers led the study are based at the Mass General Brigham Neuroscience Institute.
  2. The blood test measures a protein called p-tau217, has recently won federal clearance.
  3. The ten-year estimate, rests on much less data, should be read with caution.
  4. People p-tau217 levels were very high had a 78% risk of impairment within ten years.
  5. Physicists in Southampton and Kanpur point to a hypothetical heavy neutrino decays extremely slowly.
  6. Brookhaven in New York, the STAR team carried out its experiment, is home to the RHIC collider.
3PHRASAL VERBS
Match the phrasal verb to its definition. All six appear in today’s articles.
  1. to give someone something, or to start taking part in an activity or study ("Some participants ___ as early as 2004.")
  2. to combine information or resources from different sources into one collection ("researchers ___ data from six studies")
  3. to draw attention to something or identify it as a cause ("Physicists ___ a neglected suspect")
  4. to prepare or create something, often by mixing or heating it ("Could something as small as an oxygen nucleus ___ the matter of the infant universe?")
  5. to rely on or be based on something ("The ten-year figure ___ much less data")
4CRITICAL THINKING
Both the blood-test study and the particle-physics story rely on indirect evidence: a protein level predicting a future condition, and a lost-energy signal pointing to a plasma. What makes indirect evidence convincing, and when should scientists be most cautious about drawing conclusions from it? Consider who benefits when a result is announced as a 'hint' or 'forecast' rather than a proven fact.
5CREATIVE · HEADLINES
Write a headline for the top story in each of the following styles. One line each, no explanation:
  • TABLOID NEWSPAPER
  • LUXURY MAGAZINE
  • ACTIVIST BLOG
6WRITING
Write a short email (about 120 words) from a doctor to a healthy 68-year-old patient who has just received a high p-tau217 result, explaining what the result does and does not mean. Use a calm, supportive tone and avoid technical jargon.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • a slight rise in risk→→
  • somewhat unexpected→→
  • fairly small→→
  • a bit overlooked→→
  • quite unlikely→→
  • fairly hopeful→→
8SPEAKING
  1. Which scientific discovery from your lifetime has changed daily life most?
  2. How do news headlines make science sound more certain than it is?
  3. Would you trust a medical result more from a blood test or a scan?
  4. Which unanswered question about the universe would you most like solved, and why?