When we think of archaeology, we imagine gold crowns and stone temples. In fact, most of what archaeologists study is rubbish. Broken pots, fish bones, burnt seeds and old shoes tell us more about ordinary life than a king's treasure does, because people threw away the things they used every day.

A rubbish pit is like a book with many pages. The deepest layer is the oldest, and each layer above it is a little newer. If a team digs carefully, they can see how a village changed over hundreds of years. For example, new kinds of grain in an upper layer may show that farmers started growing a different crop.

Small things answer big questions. Fish bones show how far people travelled to find food. Cheap cups from a distant city show that traders came often. Animal bones with cut marks show which meat was popular and how it was shared. None of these objects looks valuable, but together they describe a whole way of living.

Digging destroys the ground it studies, so archaeologists work slowly and write down everything. Today many teams also scan the soil with radar first. This lets them find walls and pits without lifting a single spade, so they only dig where it really matters and leave the rest for future scientists with better tools.