theSIGNAL SCIENCE
5 September 2026
"The goal of medicine is not to add years to life, but life to years."
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Science

A Pig Named Wilma Just Saved a Man's Life

Tim Andrews had a 9% chance of getting a human kidney. Then surgeons in Boston tried something the world had never seen before.

Somewhere in New Hampshire, a 66-year-old man named Tim Andrews is walking his dog, Cupcake. That sounds ordinary. It is not. For 271 days, Andrews stayed alive — off dialysis, cooking meals, vacuuming his floors — thanks to a kidney that had, until recently, belonged to a Yucatan miniature pig named Wilma.

In January 2025, surgeons at Massachusetts General Hospital placed that organ inside him, and it worked. Nobody had ever managed that for so long. Andrews had end-stage kidney disease caused by type 2 diabetes. His odds were brutal: only a 9% chance of receiving a human kidney within five years, set against a more than 40% chance of dying or being removed from the waiting list altogether.

Kidney transplants offer the best survival outcomes for patients in his condition, but global demand for human organs vastly outstrips supply. The gap is not small — it is measured in lives. Wilma, it turned out, was part of the answer. Before her kidney was transplanted, Wilma had received 69 precise edits to her genome.

Photo: Robina Weermeijer / Unsplash
Surgeons at Massachusetts General Hospital perform the landmark pig kidney transplant on Tim Andrews in January 2025.
Discuss
  • Why do you think global demand for donor kidneys so dramatically exceeds the supply?
  • The pig received 69 genome edits before the transplant. Does the scale of that modification surprise you, and why?
  • Tim Andrews had only a 9% chance of a human kidney in five years. Should patients in that situation be offered experimental treatments more quickly?
Science

Life's alphabet just got eight letters

Every living thing on Earth — from an Antarctic moss to a street pigeon in Lagos — runs on the same four-letter genetic code. Now, researchers at UC San Diego have caught a key cellular enzyme reading a doubled, eight-letter version, and doing it accurately. The enzyme is RNA polymerase, the molecular machine that first "reads" DNA. Using cryo-electron microscopy sharp enough to image structures smaller than a single atom, the team watched it recognise and transcribe synthetic genetic letters that do not exist in nature. Stranger still, a related study found the enzyme could even read synthetic pairs that lack the hydrogen bonds normally considered essential.…
  • Should scientists be allowed to engineer life forms using entirely synthetic genetic alphabets?
∞
I was alive, and I hadn't been in a long time.
Tim Andrews, kidney transplant recipient
Science

One Drink a Day, a Hidden Cancer Risk

In 1990, alcohol killed 11,361 Americans through cancer. By 2023, that number had climbed to 23,126 — more than doubled in just three decades, according to a Lancet Regional Health study from the University of Miami. Here is the unsettling part: even one standard drink per day may be enough to raise your risk. Researchers linked elevated cancer danger to as little as five grams of alcohol — well below a single US standard drink's 14 grams. The cancers involved stretch far beyond the liver.…
  • If alcohol carries cancer warnings like tobacco, would drinking culture change?
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EUROPE · Science
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theSIGNAL IN THE LAB
1VOCABULARY
outstrips supplyproof of concept
genomeneutraliseend-stage
vastlytranscribe
2GRAMMAR FOCUS
Discourse markers — contrast and concession (Nevertheless, Whereas, Despite, However, Although, Even though, In spite of)
Contrast and concession markers signal that two ideas are in tension or opposition. 'Despite' and 'in spite of' are followed by a noun phrase, whereas 'although' and 'even though' introduce a full clause, and 'nevertheless' and 'however' connect two separate clauses.
Nevertheless · Despite · Whereas · Although · However · In spite of · Even though
  1. Tim Andrews had only a 9% chance of receiving a human kidney. , the pig kidney kept him alive for 271 days.
  2. the previous record for a genetically engineered pig kidney was just 52 days, Wilma's kidney survived nearly five times longer.
  3. being told his odds were brutal, Andrews went on to cook his own meals and vacuum his floors after the transplant.
  4. Demand for human organs vastly outstrips supply. , researchers are now turning to genetically modified animals as a potential solution.
  5. the pig kidney was always intended as a temporary bridge, it functioned successfully until a human donor organ became available.
  6. Natural DNA uses only four genetic letters, the synthetic version tested by UC San Diego researchers uses eight.
3PHRASAL VERBS
Match the phrasal verb to its definition. All six appear in today's articles.
  1. outstrip
  2. run on
  3. act as
  4. sit on
  5. run out of
4CRITICAL THINKING
The alcohol study suggests that millions of people drinking 'moderately' may be significantly underestimating their personal cancer risk. Who bears greater responsibility for closing that knowledge gap — governments and public health bodies, the alcohol industry itself, or individual consumers — and does your answer change depending on the country?
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
The pig kidney ultimately served as a 'biological bridge' until a human donor organ became available. Using evidence from the article, argue whether xenotransplantation should be developed as a permanent long-term solution or pursued strictly as a temporary measure while the human donor system is reformed.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong using words from the articles or your own knowledge.
  • useful→→
  • unwell→→
  • adjust→→
  • concern→→
  • uncommon→→
  • imprecise→→
8SPEAKING
  1. Would you personally accept an animal organ transplant if offered?
  2. Which cancer risk finding from the study surprised you most, and why?
  3. Could a longer synthetic genetic alphabet ever escape a laboratory safely?
  4. Who should decide which experimental patients receive priority access first?