Big Idea: Evolution occurs at the population level.

A study on bird feeders and beak sizes shows how an everyday human activity can affect the evolution of another species.

Some dung beetles use alternative reproductive tactics to increase their chances of finding a mate. Learn what this tells us about evolution and biodiversity.

Be a biochemist! Learn how to extract DNA from an onion and find out what DNA looks like.

Medical biotechnology allows scientists to make changes to the genomes of living things. What are the pros and cons of having access to techniques like these?

This backgrounder explains the effects of radiation on cells and DNA.