Investigate: Cells and Microbes

Kavi leans over the microscope and peers at a wafer-thin sliver of onion skin 🧅🔬. “Look — tiny boxes, all in neat rows! Those are cells, the little building blocks of every living thing.” Then Kavi lifts a sealed dish of fuzzy bread mould. “Even this mould is a tiny living thing — a microorganism — and it is built of cells too.” Kavi picks up a ruler. “But how BIG is each cell, and how fast does the mould grow? One quick look could fool me. So a real scientist measures again and again, adds the readings up and finds the average — the typical value — then says only what the numbers truly show. That is how we draw a conclusion we can trust. Let's try it!”