theSIGNAL SCIENCE
5 November 2026
"The most exciting phrase in science is not "Eureka!" but "That's funny.""
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Science

An AI Found a Hunger Switch Ozempic Missed

Stanford researchers used artificial intelligence to uncover BRP, a natural molecule that curbs appetite in animals without many of semaglutide's side effects.

What if the cure for hunger had been hiding in plain sight, tucked inside our own biology? Scientists at Stanford Medicine now think they have found a candidate. It is called BRP, and it is a naturally occurring molecule that, in early animal tests, suppressed appetite and promoted fat loss in much the same way as semaglutide, the active ingredient in Ozempic. How did they find it?

They did not wander through a lab with a pipette and a lucky guess. Artificial intelligence combed through thousands of possible biological compounds, flagging the ones worth a closer look. BRP rose to the top. Algorithms, it seems, can notice patterns in biology that human researchers might spend decades missing.

The real surprise is where BRP works. Semaglutide imitates a hormone called GLP-1, and GLP-1 receptors are scattered across the brain, gut, pancreas and other tissues. That helps explain the drug's wide reach, from slowed digestion to lower blood sugar, and perhaps its unpleasant side effects: nausea, constipation and substantial muscle loss. BRP appears to be more selective.

Photo: Julia Koblitz / Unsplash
Researchers study brain-targeting molecules in a laboratory, searching for gentler alternatives to current weight loss drugs.
Discuss
  • Why might a drug that acts on only one brain region cause fewer side effects than one acting everywhere?
  • How does using artificial intelligence to screen thousands of compounds change the way scientists make discoveries?
  • Results in animals often fail to carry over to humans. What should researchers and the public keep in mind?
Science

Could a Private Tugboat Rescue Hubble?

Hubble is falling. Slowly, yes, but relentlessly, dragged down by thin air at the edge of space. After 35 years of discoveries, NASA has asked private companies a bold question: can anyone give it a push? On October 29, the agency requested ideas, from boosting the telescope higher to servicing it or retiring it safely. Nothing is approved yet.…
  • Should governments pay private companies to save aging scientific instruments, or build entirely new ones instead?
∞
The receptors targeted by semaglutide are found in the brain but also in the gut, pancreas and other tissues.
Katrin Svensson, PhD, Assistant Professor of Pathology at Stanford Medicine
Science

The Hour That Could Darken Two Billion School Runs

Georgia's children would walk or ride to school in darkness about 71 million more times. Why? Because permanent daylight saving time would push winter sunrise an hour later. University of Washington researchers studied 14 states and estimated that, nationwide, at least 2 billion extra commutes would begin before dawn. Brighter evenings sound lovely, don't they?…
  • Should evening sunlight for adults outweigh morning daylight for children when countries set their clocks?
WORLD · Science
All 5 genetic “letters” of DNA and RNA discovered in a 4.5-billion-year-old asteroid
AFRICA · Science
Ancient ape fossil in Egypt could rewrite the story of human origins
GLOBAL · Science
Collective human metabolism produces 2 billion metric tons of CO₂ a year, global study estimates
AMERICAS · Science
Common pesticide linked to 2.5 times the risk of Parkinson’s disease
theSIGNAL IN THE LAB
1VOCABULARY
suppressed appetiteselective
hypothalamusrelentlesslyservicing
blunt chemical forcecommutes
2GRAMMAR FOCUS
Cleft sentences — It was X that / What I need is
Cleft sentences split one idea into two parts to emphasise a particular piece of information. Use 'It is/was ... that/who ...' to highlight a person, place or thing, and 'What ...…
It · What · that · who · where · is · was · not
  1. was artificial intelligence that scanned thousands of compounds and flagged BRP as worth a closer look.
  2. It is in the hypothalamus BRP appears to act, rather than throughout the body as semaglutide does.
  3. surprised the researchers most was where BRP works in the brain.
  4. It was Katrin Svensson explained that BRP activates different brain cells from those targeted by GLP-1 drugs.
  5. What the Stanford team is preparing the next major step: testing whether BRP is safe in humans.
  6. It was until October 29 that NASA formally asked private companies for ideas to save Hubble.
3PHRASAL VERBS
Match the phrasal verb to its definition. All six appear in today’s articles.
  1. to search through something thoroughly and carefully (combed through)
  2. to move up from a lower position to become the most noticeable or best (rose to the top)
  3. to be gradually pulled downward by a force (dragged down)
  4. to make something happen or begin at a certain time or place (would push winter sunrise an hour later)
  5. to move around a place without a clear purpose or direction (wander through a lab)
4CRITICAL THINKING
Each of today's stories involves a fix or a choice that looks neat on paper: a molecule that mimics a blockbuster drug, a commercial rescue for a telescope, a permanent clock setting. Pick one and ask who is making the claim, what evidence they have so far, and what they might not be telling us. What single piece of additional information would most change your opinion of it?
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 scientist who has just spent ten years studying BRP and the hypothalamus. Write a short, honest letter (120-150 words) to a friend explaining why you feel both excited and nervous about the next step.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • slightly hungry→→
  • somewhat surprising→→
  • a little unpleasant→→
  • fairly promising→→
  • slightly risky→→
  • a bit dark→→
8SPEAKING
  1. Would you take a pill that removed your appetite completely? Why or why not?
  2. Which would you trust more: an algorithm's discovery or a scientist's hunch?
  3. Is eating an emotional habit, a biological need, or both? Explain.
  4. Should famous old machines, like Hubble, ever be allowed to retire?