A biology professor and fossil hunter from the University of Northern Iowa is speaking to hundreds of Iowa high school students this afternoon. At the U-N-I Science Symposium, Professor Jeff Tamplin is talking about his two expeditions to Antarctica — which is basically a big block of ice. About 98-percent of the continent is ice, and just two percent is rock — which is the very tip of a mountain range. It makes life a challenge for fossil hunters.Tamplin was on an expedition to Antarctica in 1991 during which the first dinosaur bones were discovered on that continent. Tamplin hopes his talk in Cedar Falls will inspire other Iowa students to reach for their dreams — in the field of science. At the Symposium, high school seniors from across Iowa compete for four-year tuition scholarships in the sciences, math and technology.