Chemical

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Chemical
A sign warning of "Dangerous chemicals". (TV: School Reunion)

By 2007, a sign in a Deffry Vale High School classroom warned of "Dangerous chemicals" within. (TV: School Reunion)

The 456 found that human children produced chemicals which felt "good". (TV: Children of Earth: Day Five)

Mia Bennett proved that Earth plant life could grow on Martian soil with the help of chemicals. (TV: The Waters of Mars)