Ultraprocessed diets were linked to dementia risk, research suggests anesthesia is more like a coma than we thought, and a brain tumor radiation device shows promise. Read more in this week’s WSJ Health newsletter:

Plus, new research on anesthesia and a brain tumor radiation device.

Milei’s Online Trolling Fueled His Rise. It’s Hurting His Free-Market Overhaul.

The leader used X to vault from obscurity to power. Now his social-media feuds are alienating…

Real-Time Satellite Intelligence Is Making Ukraine’s Drone Strikes Deadlier Than Ever

Commercial satellite imagery, which is sent straight to soldiers’ phones, is speeding up the kill chain…

Xi to Leave China for First Time This Year. Destination: Pyongyang.

The visit speaks to North Korea’s rising importance among the U.S.’s biggest adversaries.

With Ukraine Stronger on the Battlefield, Zelensky Offers to Meet Putin

The Ukrainian president, writing his first letter to his Russian counterpart since Moscow launched its full-scale…

American Pleads Guilty to Working as Chinese Agent in U.S.

Thomas Pauken II is the latest in a series of prosecutions of Americans accused of secretly…

At Russia’s Davos, Putin Tells His Soldiers to Keep Fighting

The Kremlin chief rejected Ukrainian President Volodymyr Zelensky’s offer to meet and appeared more interested in…

Bodycote Shares Fall After Apollo Pulls Back on Making Firm $2 Billion Takeover Offer

The stock was down more than 9% after Apollo Global Management ended discussions on a takeover…

Evoke Shares Rise After Board Agrees to $326 Million Takeover by Bally’s Intralot

London-listed shares in the owner of betting brands William Hill and 888 were up 13% at…

There’s More to Space Stocks Than SpaceX

Rocket Lab gives investors another way to play the space race.