Editor's note: We're looking back at the top Houston innovation news for the second half of September. Catch up on the latest from the Ion District, Oxy, Eli Lilly, and more. Here are the five most-read InnovationMap stories from September 15-30: 1. Houston's Ion District to expand with new research and tech space, The Arc Houston's Ion District is set to expand with the addition of a nearly 200,000-square-foot research and technology facility, The Arc at the Ion District. Rice Real Estate Co...