theSIGNAL SCIENCE
7 November 2026
"The best way to predict the future is to study the quiet changes of the present."
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Science

A Transplant Drug Meets the Alzheimer's Gene

Rapamycin, a medicine given to transplant patients, improved brain blood flow in middle-aged carriers of the APOE4 gene variant, researchers in Missouri report.

What if one of the earliest warning signs of Alzheimer's disease is not a lost name or a forgotten key, but a slow trickle of blood? That is the idea driving Ai-Ling Lin, a professor in the School of Medicine at the University of Missouri. She studies APOE4, a gene variant that substantially raises the risk of Alzheimer's later in life. People who carry it can show reduced blood flow in certain brain regions years before any memory trouble appears.

The circulation, in other words, may falter long before the mind does. So Lin's team tried something unexpected. They turned to rapamycin, a drug that doctors already use to stop the body from rejecting transplanted organs and to treat some rare conditions. It was first associated with surgery wards, not memory clinics.

Yet scientists on several continents have also been studying it as a possible brake on biological aging. Before moving to Missouri, Lin had tested it in mice carrying APOE4. The animals showed slower brain aging and better blood flow. The obvious next question was whether humans would respond in the same way.

Photo: Milad Fakurian / Unsplash
Brain scans can reveal reduced blood flow in people at genetic risk of Alzheimer's disease.
Discuss
  • Why might changes in brain blood flow be a better early warning sign than memory tests?
  • Should healthy people with a high-risk gene take a drug before any symptoms appear? Why or why not?
  • Rapamycin was designed for transplants but may help brains. What other medicines have found unexpected second lives?
Science

The 1.5C Promise Is Slipping Away

Nepal just became the first country approved for money from a fund that repays climate damage, after August's flash floods. Meanwhile, the 2015 Paris pledge to cap warming at 1.5C is, a UN report says, likely to be broken within years. Here is the twist: 2024 already ran hotter than that, yet Paris isn't "broken". Why?…
  • If one hot year doesn't break the Paris target, what actually should?
∞
If we can slow down aging in the brain for those people most at risk, maybe we can reduce the risk of them developing Alzheimer's disease.
Ai-Ling Lin, professor, University of Missouri School of Medicine
Science

Dinosaur Blood, Still Hiding After 115 Million Years

Could blood outlast an entire geological era? In Brazil, it apparently did. Researchers led by Curtin University's Kliti Grice found mineralised red blood cells inside the leg bones of Aratasaurus museunacionali, a predatory dinosaur. Chemical tests then detected heme, a hemoglobin component, plus collagen-linked amino acids. The molecules were thought too fragile to survive, yet they did, perhaps protected by minerals.…
  • If blood molecules survive 115 million years on Earth, how should we search for life elsewhere?
WORLD · Science
All 5 genetic “letters” of DNA and RNA discovered in a 4.5-billion-year-old asteroid
AMERICAS · Science
AI helps Stanford scientists discover a “natural Ozempic” with a surprising advantage
GLOBAL · Science
Gene editing could replace a lifetime of medication, but there's a catch
EUROPE · Science
Future warming events will outdo the extreme heat waves of the recent past, new study finds
theSIGNAL IN THE LAB
1VOCABULARY
faltertrickle
variantrejectingbrake
strikingmineralised
2GRAMMAR FOCUS
Gerunds and infinitives: complex patterns (stop to do vs stop doing)
Some verbs change meaning depending on the form that follows: 'stop doing' means to end an activity, while 'stop to do' means to pause in order to do something else; 'remember/regret doing' refers to the past, while 'remember/regret to do' refers to a duty or a present action. Other verbs, such as 'try', 'go on' and 'mean', also shift meaning, and prepositions are always followed by a gerund.
to wait · waiting · to test · testing · to keep · to repay · to explore
  1. Lin's team did not stop rapamycin on mice; they went on to run trials with middle-aged human volunteers.
  2. Doctors who prescribe rapamycin to transplant patients are used to it as a way of preventing organ rejection.
  3. Researchers are not content for symptoms to appear, so they hope to treat people while they are still healthy.
  4. Scientists on several continents have not stopped whether rapamycin could slow down biological aging.
  5. Nepal was the first country approved money from the fund that repays climate damage after August's flash floods.
  6. Officials warn that if the world carries on burning fossil fuels at the current rate, the 1.5C pledge will be broken within years.
3IDIOMS
Define each idiom in your own words. Then write one in a sentence of your own.
  1. to put the cart before the horse (e.g. celebrating better blood flow as if dementia had already been prevented)
  2. to be a ticking time bomb (e.g. carrying a gene variant that raises the risk of disease later in life)
  3. to hit the nail on the head (e.g. explaining that a target is judged as a twenty-year average)
  4. to be a drop in the ocean (e.g. a small fund payment compared with the damage caused by flash floods)
  5. to stand the test of time (e.g. molecules surviving for 115 million years)
4CRITICAL THINKING
The articles show three situations in which the evidence is real but its meaning is easy to overstate: a drug trial, a climate target and an ancient fossil. Choose one and examine how a headline or a quick summary could mislead readers about what was actually found. What wording would you use instead to stay accurate without losing the reader's interest?
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
Imagine you are a science journalist who has just interviewed one of the researchers in these articles. Write a short paragraph (80-100 words) describing the one question you would most want to ask them, and explain why the answer would matter to ordinary readers.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • The results are quite surprising.→→
  • The drug slightly improved blood flow.→→
  • It is a little fragile.→→
  • We should be a bit careful.→→
  • The warming target is under some pressure.→→
  • The flood caused some damage.→→
8SPEAKING
  1. Which would you rather hear about first: a breakthrough or a warning?
  2. Describe a news story that made you change your mind about something.
  3. Is it better to learn about science from headlines or full articles?
  4. How much do you trust a study that has only been tested once?