PCA Mardan

https://www.quantamagazine.org/physicists-finally-nail-the-protons-size-and-hope-dies-20190911/

Physicists Finally Nail the Proton’s Size, and Hope Dies | Quanta Magazine A new measurement appears to have eliminated an anomaly that had captivated physicists for nearly a decade.

Time line .........Models of atoms........

Why cloudy night seems hot.....

Comet?????????

Question: What is Galaxy.........

Fresh coaching classes for 9th and 10th will start from 10 July....................