Welcome to Ask A Biologist. This site has a large collection of biology learning materials that includes stories, games, activities, videos, and a podcast.

Every year, vaccines protect millions of people from getting sick. But how, exactly, do vaccines work? Learn the science behind how vaccines protect us from disease.
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As you go about your day, breathing and thinking, with your heart beating, your body is working. It sends and receives signals, grows, and stores fat, among hundreds of other functions. All of these functions make up your physiology, or how your body works. The same is true for every living animal.

Scientists thought that flying reptiles known as Pterosaurs were slowly dying off before an asteroid caused a huge die-off on Earth. But new fossils found in Africa tell a different story.

You may have heard that bacteria can be good or bad. But what if some bacteria can be both? Let’s find out more about bacteria that are sometimes mischievous.