This week, we dive into the science to find out how safe vaccines really are.

Last week we explored the science behind vaccine safety. This week we try to understand where these fears came from, and why they persist.

Hassan speaks to Short Wave’s Emily Kwong about de-stigmatizing sleeping in late, and why a good night’s rest is so important for your immune system.

Students investigate the causes of disease and study the size of pathogens compared with human immune cells.

Students learn about the specific nature of responses generated by the adaptive immune system.

Students learn about the body’s first line of defense—the innate immune system.

Students explore the importance of the immune system and its different components.

Students explore the relationship between pathogens and the body’s response, including drawing conclusions about why humans still get sick despite immune system defenses.

Students explore the constant battle between pathogens and the immune system, focusing particularly on the different ways that pathogens adapt to overcome the immune system.

This video illustrates how viral infection begins.

This video profiles antibodies, the human immune system’s ultimate weapon.

This video illustrates how hepatitis B virus uses decoys to overwhelm the immune system.