Jacob Reedy sets off gunpowder under the watchful eye of John Straub during the Pinhead Science program at the Cortez Cultural Center. The next program, at 5:15 p.m. Wednesday, is about Four Corners rock art. Kids will have a chance to make their own rock art.

Liam Pope and Mary Straub watch the reaction when zinc and sulfur are ignited at the Pinhead Science program. The next program is on Four Corners rock art on Wednesday at 5:15 p.m. behind the Cortez Cultural Center.