Science

Here is a very quick video that will quickly describe "What energy is."  It discusses chemical, nuclear, and dark energy.  

This health-related video discusses the importance and science of sleep.  It discusses why some don't sleep well and many of the external stimuli that keep us from sleeping.  Circadian Rythem, Melatonin, Insomnia, are all discussed in the video.

This educational video discusses why our bodies need water and answers how much we should drink every day.

Find out why the sky is blue in this SciShow video.  The video discusses the way light reflects colors and the fact that you really have to be human to see blue.

Find out how many calories people need to eat per day.  The video discusses what calories actually are, how your body burns them, and the relationship between activity level and calorie intake.

Demonstrate how magma is more buoyant than the surrounding earth material.  Volcanoes erupt simply because the melted rock rises up through cracks in the crust.  This science experiment will easily demonstrate this concept.

Here is a quick video animation that demonstrates how Phagocytosis gets rid of bacteria from in the body.  

This volcano video demonstrates and discusses how composite and shield volcanoes are created and describes their lava type.  The Ring of Fire and magma formation are briefly discussed.

This animated and narrated video demonstrates how a flu virus exits one person and enters another.  Then it visually describes how the virus will be welcomed into a cell where it will replicate its DNA.  There is a great part that shows some Phagocytosis as your body tries to destroy the virus.

This video demonstrates a science experiment on the formation of calderas.  The idea is great.  Either show the video or demonstrate the formation with your students.