Dr. David G. Simons spent his life marveling at the world around him and pushing the boundaries of human knowledge and experience. But no matter his project of the day, the focus was always to improve the lives of others.A world-famous doctor and researcher, Simons died April 5 due to congestive heart and kidney failure at the age of 89. He had spent the last several years of his life in Covington, near the hometown of his wife Lois.Friends and family members described Simons as having incredible intelligence, a thirst for knowledge and a fearless spirit, which made him a natural candidate to