NEW YORK, Feb. 6 -- Columbia University issued the following news: * * * How Can Robots Improve Our Waterways? Cody O'Ferrall worked as a fisherman in Alaska before studying here. Now he's building a boat to clear urban ponds of algae. Cody O'Ferrall first discovered an interest in engineering while studying at St. John's College in Santa Fe, New Mexico, where students follow a curriculum focused on the Great Books. There, he developed an interest in physics and the ways that we use math to  more PR