A story about National Lab Day notes that CHARLES BRENNER, head of biochemistry at the University of Iowa's Carver College of Medicine, plans to visit classes of biology students aged 15–16 at a local high school on May 12, where he will use yeast to demonstrate cellular lifespan and to show cells' ability to form colonies at different ages. “They always find it interesting to look at cells under a microscope,” Brenner says, recalling past visits.