Science The Coming Sewer Gold Rush 5:26am October 12, 2017 Science Share URL copied to clipboard! Copyright 2017 NPR. To see more, visit http://www.npr.org/. 300x250 Ad More Morning Edition Russian troops press toward Ukraine's second largest city, Kharkiv Education Marie Fowler, 83, becomes Howard University's oldest doctoral graduate 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate