Learn what functional groups are, explore the seven key types in biology, and see how they influence solubility, enzyme reactions, and biological molecules.
Ships take on ballast water to stay stable, but that water carries hidden hitchhikers. Learn how invasive species spread globally and what's being done to stop it.
HCFCs replaced CFCs but still harm the ozone layer and climate. Learn what they were used for, why they're being phased out, and what's taking their place.