Hey there, future Biologists! Prepare to embark on an amazing journey inside the world of viruses. Imagine them as tiny, non-cellular secret agents with one mission: to infiltrate the cells of other organisms and take over their machinery. So let's dive in!

Miniature Marvels - Viruses are among nature's smallest entities, ranging from 20 to 300 nanometres in diameter. They're even smaller than most bacteria, and far tinier than your own cells! Imagine being so small that you could sneak into a bustling city (aka a cell) unnoticed. They need to be this tiny so they can sneak into host cells undetected.

No Growth Spurts Here - Unlike you, viruses don't grow. Think of them as a toy car assembled from tiny components; once assembled, they're already at full size. This means that viruses have a fixed number of pieces, just like your LEGO sets, which determines their final size.