Tadpole species that lost their lungs through evolution never re-evolve them, even when environmental change would make it ...

Some tadpoles break the rules of biology. Instead of developing lungs as they grow, they lose them entirely and still manage ...

Five years ago Dr. Clarence W. Dail, at Los Angeles’ Rancho Los Amfgos Hospital, noticed that one of his polio patients, a young man whose breathing muscles were almost completely paralyzed, had ...