What does it mean science?   

Science is the study of the world around us. Scientists use observations, experiments, and evidence to understand how things work and why things happen. It helps us learn about everything from how plants grow to how the stars move in the sky.

What does it mean cardiology ? 

Cardiology is the study of the heart. Cardiologists are doctors who specialize in understanding how the heart works, diagnosing heart-related problems, and treating heart diseases. They help keep our hearts healthy and strong.