CFAES scientist Mary Gardiner will speak on vacant land, biodiversity and ecosystem health, focusing on her research in the city of Cleveland, at 7 p.m. tonight, Jan. 23, at the First Amendment Public House, 150 W. Liberty St., Wooster. Her talk is part of the free Wooster Science Café series. Organizers offer the series as a forum for discussion of timely topics between scientists and the public. The sponsors are the College of Wooster and CFAES’s research arm, OARDC.