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The First Cohort

Medical research, with the receipts

Investigations

A Gene-Editing Trial Killed a 6-Year-Old. Nature Published the Science and Left Her Out of the Record.

Her parents paid $860,000 to base-edit their daughter's brain. She died of an immune reaction within a week, and the published paper never says so.

Mira Petrov · 8 min read

Editorial illustration for the gene-editing trial death investigation

Today's index

Cancer
Illustration for the two-strike cancer resistance model story

The Evolutionary Fix for Drug Resistance Works Best on a Tumor Too Small to Find

Nutrition & Food

Pepsi Paid $1.95 Billion for Poppi, in a Category That Averages as Much Sugar as Fiber

The FDA Revoked Two Petroleum Dyes That Industry Abandoned Before Most Americans Were Born

The Fruit Juice Sold to Parents as the Healthy Choice Tracks With Higher Blood Pressure 25 Years Later

Metabolic & Weight
Illustration for the orforglipron brain reward dopamine story

Orforglipron Reaches Deep Into the Brain's Reward Circuit and Turns the Dopamine Down

The GLP-1s That Barely Move the Scale Don't Cause Hair Loss, and That's the Clue Everyone Missed

A Gut Microbe Was Feeding Ammonia to Sick Livers. A Michigan Peptide Cut Off the Supply in Monkeys.

Brain & Aging

The Sweeteners Sold to Diabetics as the Safe Swap Tracked With Faster Brain Aging

Autoimmune & Inflammation
Illustration for the obakulactone arthritis bark JAK pathway story

A Chinese Bark Compound Reached the Black-Box Arthritis Drugs' Pathway From Upstream, in Rats

A Petri Dish of Angry Immune Cells, a Little Ultrasound, and a Very Big Headline

Nutrition & Food

The AHA Says Coffee Is Safe to Five Cups a Day. The Energy Shot's Problem Isn't the Caffeine.

In the Lab, Coffee Flipped an Anti-Aging Switch. The Caffeine Barely Did.

Brain & Aging

Anti-Tau Alzheimer's Drugs Keep Hitting Their Target and Missing the Disease

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One weekly dispatch. The stories that held up.