Researchers and scientists who spend their careers searching for new species in every corner of the globe know their field better than anyone else. But, what happens when they encounter something they ...

In the 2000s the capital of Colombia was famous for its TransMilenio bus rapid transit network, but as that became overcrowded, authorities made a decision to develop metro and tram-train routes, ...

American Airlines chief says "we don't know why" military helicopter came into path of passenger jet before collision.

Army helicopter that collided with passenger jet near DC's Reagan National Airport was on training flight, official says.