John Solder, regional finalist at the Siemens Competition, explains his work on modifying neurons to be activated by light. The Siemens Regional competitions took place in Johnson on Friday and Saturday. Jaswanth madhavan—The Tech May. 9, 2016 Facebook Twitter Reddit Print John Solder, regional finalist at the Siemens Competition, explains his work on modifying neurons to be activated by light. The Siemens Regional competitions took place in Johnson on Friday and Saturday. Jaswanth madhavan—The Tech