Alzheimer's gene APOE4 has a reversible weakness, and Delhi fixed its grid

In people carrying APOE4, pericytes, the cells that normally steady small vessels and help maintain the blood-brain barrier, turned into myofibroblast-like cells that lay down scar tissue. The result was fibrosis in the vessel wall and more amyloid piling up around it. Then they blocked TGF-β signaling, a channel cells use to talk and remodel tissue. Pericyte coverage came back, and fibrosis and amyloid dropped, including in aged APOE4 mice 2. The second paper describes a stem-cell-derived human brain tissue platform meant to speed up drug testing 2.

The drug's name and trial numbers are not in the piece. The detection half is further along. Diane Simeone's PRECEDE study aims to enrol 20,000 people with a family history, certain abnormal pancreatic growths, or a risky genetic profile; a little more than 12,000 are in, and more than 50 participants have been diagnosed, many at the earliest stages 18. Five-year survival can top 80% when these tumours are caught early, yet more than half are found after spread, a figure Simeone says has barely moved in her 30 years running a lab 18.

On the first day of this school year, no kid would wait their turn, and no resident paid any attention to the pancakes 60. Kansas State researchers finished a first full year of data collection. In 30 residents measured about a year apart, cognitive functioning held steady, depression symptoms went down, and independence in daily activities went up. They also report increased social-emotional development in the children, and they interviewed 17 residents about life in the new building 60. Administrator Teresa McComb puts it this way: when the kids are around, "everybody kind of gets a little bit lighter" 60.

He thought it was far-fetched; they asked the Greater New Orleans Foundation for $1 million and got it 235. When Hurricane Francine knocked out power in 2024, his church, First Grace United Methodist, filled up with more than 100 people in air conditioning, charging medical devices and phones 235. There are now 14 Community Lighthouses in New Orleans and six more elsewhere in Louisiana, in churches, synagogues, mosques and community centers 235.

It did not succeed, but it made a big leap on a related problem 15. Youness Lamzouri, at the University of Lorraine, confirmed that progress by a different and more intuitive route, then went further and found new results about how primes are distributed 15. He compares it to an archaeological site: machines can extract the artifact, but humans dig carefully to learn how it came to be buried there 15.

For about 40 years, conformal field theories have predicted that a quantum system at a tipping point should have energy levels spaced in precise ratios, like the rungs of a ladder 10. Manuel Endres's group at Caltech, with Jason Alicea's theory group and colleagues at Paris-Saclay and the Technical University of Munich, built quantum simulators out of laser-trapped atoms. They recreated two such tipping points, the Ising and tricritical Ising theories, and in a Nature paper made the first direct measurements of those energy levels. The atoms fell into the predicted ratios 10. The transition has nothing to do with temperature: it is a purely quantum effect, near absolute zero 10.

Power disappears as heat in the wires and into theft and unpaid bills. Over the past 25 years Delhi took its losses from about 50% to 5% 188. Electrical engineer Mini Shaji Thomas, who has lived in Delhi since the 1990s, tells the story in "The Epic Comeback of Delhi's Power Grid" 188. No single gadget did it. Equipment across the network was replaced, government arms agreed on reforms, rules were rewritten, money was spent and habits changed 188. Georgia went from over 16% to about 8% between 2002 and 2023; Singapore fell from 6.6% to 0.2% 188.