A new type of lidar is allowing physicists to study cloud tops at a resolution 100 to 1,000 times higher than before.

Prof Brennan uses a surgical drill to remove a flap of skull. The exposed brain is pink, flushed with blood, and gently ...

Download CBSE Class Physics 12 Pre-Board Sample Papers 2025–26 with solutions for all subjects in free PDF format. These papers are curated by experts as per the latest CBSE syllabus and exam pattern.