Student News Today — September 16, 2026

The natural world is full of mysteries waiting to be unraveled, and scientists are making progress on multiple fronts. Astronomers are getting a rare glimpse into the life cycle of stars, thanks to a 'born-again' star that's offering a unique chance to study stellar evolution in real time. Meanwhile, on Earth, researchers are uncovering secrets from the past, such as the well-preserved tooth from a Pacific mastodon found in a creek in the San Francisco Bay Area, which provides a fascinating window into the region's ancient history.

In other areas of research, scientists are working to address pressing global challenges. For example, a new study is highlighting the impact of high turnover rates in Tanzania's agro-dealer sector on farmer fertilizer adoption, with implications for food security and sustainable agriculture. Elsewhere, researchers are exploring innovative solutions, such as using smart nanoparticles to deliver antibiotics directly to the bacteria that cause stomach ulcers, and debating the potential and pitfalls of geoengineering techniques, like artificially dimming the sun, to mitigate the effects of climate change. Additionally, advances in materials science are revealing new insights into the behavior of disordered atoms and their ability to steer light pulses.

Today's signal:
• 'Born-again' star offers rare chance to watch stellar evolution in real time (phys.org)
• Well-preserved tooth from Pacific mastodon found in a creek in San Francisco Bay Area (phys.org)
• How high turnover rates in Tanzania's agro-dealer sector affect farmer fertilizer adoption (phys.org)
• Plans to artificially dim the sun have divided scientists—here's what they're actually arguing about (phys.org)
• Disordered atoms steer shared light pulses by matching motion and timing (phys.org)
• Smart nanoparticles deliver antibiotics directly to H. pylori (phys.org)