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Drag mouse with left button pressed inside one of the windows to rotate the corresponding molecule !
Carbon (has many forms of appearance - the spheric one "buckminsterfullerine" that was found by scientists a few years ago is displayed here)

Water (2 atoms of Hydrogen and one of Oxygene form the molecule)

Carbondioxide (1 Carbon and 2 Oxygene atoms)

Hydrogen (forms as normal gas a double H-atom molecule)