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Many germs spread by our hands, and often times, people don't wash their hands well enough to get rid of germs.

Doctors often send a sample of blood to a lab, to make sure their patients are healthy.

In this activity, learners explore how eating unhealthy food can damage a heart and arteries.

En esta actividad, Mateo y Cientina enseñan a usar modelos para ver las causas de las fases lunares.

Some bugs can walk on the surface of a lake, stream, river, pond or ocean.