Introduction: What Is Chemistry? Chemistry is often called the central science because it connects physics, biology, geology, and environmental science. It studies the composition, structure, properties, and changes of matter. Everything you see, touch, or breathe — from the air you inhale to the device you’re using right now — is a product of chemical […]
1. What Is Speed? Speed is one of the simplest yet most profound concepts in physics.It measures how fast an object moves — or in scientific terms, the distance covered per unit of time. Speed=DistanceTime\text{Speed} = \frac{\text{Distance}}{\text{Time}}Speed=TimeDistance Speed tells us not only how quickly something changes its position but also forms the foundation for understanding […]
Human survival without food is a fascinating yet brutal demonstration of the body’s adaptability. When food intake stops, the body initiates a well-orchestrated sequence of metabolic and hormonal changes to keep vital organs—especially the brain and heart—functioning as long as possible. Understanding this process reveals not just how long we can live without food, but […]