High

Health/Phys. Ed. (X) - Elementary (X) - High (X) - WGBH (X)

Three Mile Island Cooling Towers

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In this Building Block video from Frontline: Nuclear Reaction, the four cooling towers at the Three Mile Island nuclear power plant dot the horizon at sunrise. Smoke billows from the two towers on the left. The Susquehanna River lies in the foreground.

Don't Mess with Mercury

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Learn how to avoid mercury hazards, in this short video from the Agency for Toxic Substances and Disease Registry (ATSDR). Graphics and animations illustrate the liquid appearance of elemental mercury and warn viewers about the dangers of exposure. Hear about how you should not touch mercury and how it can contaminate objects in the home.