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Physical sciences/Chemistry/Chemical compounds

The 2017-2018 cohort of AAAS-Lemelson Ambassadors has created inventions ranging from waterless toilets to colorized disinfectant additives.
September 16 is the International Day for the Preservation of the Ozone Layer. How much do you know about the ozone layer?

The Toxic Substances Control Act (TSCA), enacted by Congress in 1976, is the primary federal statute regulating industrial chemicals in commerce. But the law has not accomplished as much as its authors intended, and reauthorization by Congress has been stalled.

The Toxic Substances Control Act (TSCA), enacted by Congress in 1976, is the primary federal statute regulating industrial chemicals in commerce. But the law has not accomplished as much as its authors intended, and reauthorization by Congress has been stalled.