Russell Lehmann wasn’t diagnosed with autism until fifth grade, but he says the signs were there earlier. He remembers crying when he had to leave his mom’s side to go to school and struggling ...

This interaction is determined largely by the electronic structure of atoms and molecules; photon absorption or emission is associated with an electron moving from one energy level to another.

Atlanta air quality receives failing grade A new report from the American Lung Association says that Atlanta residents are breathing some of the worst air in the Southeast.

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