WBUR’s Science Friday will host a free event, the Science Friday Climate Fair, at WBUR’s CitySpace (890 Commonwealth Avenue, Boston) on April 18 at 4PM-8PM for kids of all ages to explore the ways scientists, educators and engineers are inventing solutions to climate change, creating sustainable systems and learning from the natural world. (Interactive stations are best suited for Grades 6-8.) Exhibitors include: