With a tap of his walking stick on the newly unveiled track, the legendary American long-jumper Bob Beaman signalled on Friday morning that the Olympic athletics programme was under way. An expectant ...

KNOXVILLE, Tenn. — Tennessee’s rivers and streams are among the most biodiverse freshwater systems in the world, but one of their most important inhabitants is increasingly at risk. Freshwater mussels ...

PHILADELPHIA – Water tanks line a room in this city’s Water Works on the bank of the Schuylkill River. Inside are small fish that are hosts to tiny organisms that researchers in the nation’s sixth ...