"POPnology" exhibition held at Pacific National Exhibition in Vancouver

People watch a Mars rover in motion at the "POPnology" exhibition at the Pacific National Exhibition in Vancouver, Canada, Aug. 19, 2018. "POPnology" is a touring showcase that features ideas like artificial intelligence, 3-D printers and virtual reality, and how those things evolved from science fiction to science fact. (Xinhua/Liang Sen)