Our body manufactures antibodies that are the exact shape for the antigens it encounters. The simulation shows a 3-D model of an antibody and antigen pairing. It allows young scientists to explore the complementary shapes.

In this online interactive English vocabulary skills worksheet, students respond to 13 multiple choice questions that require them to fill in the blanks in sentences with the appropriate prepositions.

What do you know about the different human body systems? This site features information on each of the different systems. Students and teachers will benefit from this comprehensive resource.

This is the fourth in a series of five missions that deal with how infectious diseases are spread. In this interactive adventure game, students are part of a team of investigators conducting field and laboratory investigations to learn...

Test your understanding of the human body and all of its complexities with these interactive worksheets, games and quizzes.

Explore the production of six different types of vaccines. This activity is interactive, allowing you to take part in the production of the different vaccines.

Play this educational interactive online game to learn how sneezing infects other humans with a virus. Children and the elderly are the easiest to infect because of their immune systems. Includes facts about the common cold.