If you've ever been on the river or seen one, you've probably realized they typically curve and wind instead of flow in straightaways. It seems like it's pretty obvious why rivers curve and often follow and 'S' shaped pattern, but a lot more goes into it than following the path of least resistance. ...

"When we try to pick out anything by itself, we find it hitched to everything else in the Universe." - John Muir When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable "trophic cascade" occurred. What is a trophic ...