* April 28 and 29, Monday and Tuesday -- Tim Flannery, a legendary Australian explorer, historical ecologist and prize-winning author, will give two lectures at ºÙºÙÊÓƵ. His talks will be "Evolutionary trends on two continents: Australia and North America," on Monday, April 28, and "New data on Pleistocene extinctions in Australasia: implications for North America," on Tuesday, April 29. Both lectures are free and begin at 4:10 p.m. in the AGR Room, Buehler Alumni Center and Visitors Center. Although best known for his popular writing on what he calls "historical ecology," Flannery, director of the South Australian Museum, is a skilled zoologist who reported in 2001 that prehistoric human hunters, rather than glaciers or disease, drove woolly mammoths and other giant animals to extinction in both North America and Australia. His talks are part of the Division of Biological Science's Storer Lectureship in Life Sciences series, which brings eminent biologists from around the world to speak at ºÙºÙÊÓƵ. The anthropology and the environmental science and policy departments are co-sponsoring Flannery's visit.