How do we know about the past?
Clues from Yesterday
How do we know about the past?

You weren't there when your great-great-grandmother baked bread in her kitchen. You weren't around when dinosaurs stomped through swamps, or when the first stars flickered on. So how do we know any of it happened? How can we be sure what the past was really like?
The past leaves clues behind — like a story written in objects instead of words. Every old thing that survives to today is a messenger. A broken clay pot. A fossil pressed into rock. A letter tucked in a drawer. Each one whispers: "This is what happened. I was there."
