Definition
Something contagious spreads quickly and easily from one person to another, especially a disease. Itβs like gossip in high school; once it starts, everyone seems to catch it. Contagious things aren't just diseases; enthusiasm or even laughter can be contagious too. Think of it as the 'copy-paste' function of germs or feelings. Unlike something genetic, being contagious requires close contact. The effect is often rapid, turning isolated instances into widespread phenomena. Consider a yawn β seeing someone else yawn often makes you yawn too! π