Season 24, Episode 4
Yellow Tuft Alyssum - A new invasive species from Europe has been introduced in the Illinois River valley. Mt. Hood's Volcanic Past - Mt. Hood is an active volcano with a history of relatively recent eruptions. Warren Falls - A man-made waterfall in the Columbia Gorge blocks a natural fall. One man wants to end that.
Aired: 10/25/12Video has closed captioning.