Regeneration
Doctor Who leaves Disney+ after two seasons
The long-running sci-fi series Doctor Who is departing Disney+ in the U.S. after its two-season run on the streamer. The show will continue on the BBC with a 2026 Christmas special, while previous episodes remain available on Disney+. The departure follows Ncuti Gatwa's exit as the Doctor, with Billie Piper regenerating into the role.
Flatworm stem cells defy local control in regeneration
Researchers have discovered that planarian flatworms regenerate lost body parts through stem cells guided by distant signals rather than nearby neighbors, challenging established stem cell biology. This finding, published on October 15, 2025, could inform new approaches to human tissue repair. The study highlights the unique independence of these stem cells in one of nature's simplest animals.