Sat Sep 20 02:30:00 UTC 2025: Okay, here’s a news article based on the provided text, along with a summary:
**Summary:**
This text appears to be part of an email newsletter from “The Hindu” newspaper, dated September 20, 2025. It highlights several regular features including sections on world affairs from an Indian perspective, cinema reviews, technology news, science, data analysis, health, and books. It also includes a short Q&A explaining the “coffee ring effect,” a phenomenon where coffee spills leave a dark ring at the edge due to evaporation and particle movement. The text also provides ways on how to counter the “coffee ring effect” by changing temperature, concentration or fluid.
**News Article:**
**The Hindu Explains the Science Behind Your Coffee Stain**
*September 20, 2025* – Ever wondered why that spilled coffee leaves a distinct ring? Today’s edition of *The Hindu* delves into the fascinating science behind the “coffee-ring effect” in its regular Q&A section.
The article, featured in the September 20, 2025 publication, explains that the dark ring with a pale center we often observe after a coffee spill dries is a result of how the liquid evaporates and how the coffee particles move within the drop. According to the article, the edge of the drop is usually fixed, and evaporation occurs more rapidly at the edge than in the center. This faster evaporation at the edge creates a current that carries suspended coffee particles outwards, depositing them at the rim and creating the characteristic ring.
However, the news explains that this ring can be weakened or erased by circulating the fluid differently, such as by temperature or concentration differences. Small amounts of molecules, added polymers or some glycerol can also change the flow.
The scientific explanation is part of *The Hindu’s* broader coverage of science, accessible through its weekly newsletter, “Science For All,” which aims to demystify scientific concepts for a wider audience. Other regular features highlighted in today’s digest include “The View From India,” focusing on global events through an Indian lens, “First Day First Show” for movie and streaming reviews, “Today’s Cache” covering the top tech stories, “Data Point” for data-driven analysis of news, “Health Matters” on health and wellness, and “The Hindu On Books” for literary news and reviews.
First Piper 