Life on Earth began in its simplest form — single-celled organisms. These tiny, self-sufficient entities floated in ancient oceans over 3.5 billion years ago. Yet, from these microscopic beginnings emerged the incredible diversity of complex, multicellular organisms we see today — from plants and fungi to animals and humans. But how did this monumental leap […]
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 […]