The Missing Piece:

James Kaplan, 8, and his sibling Charley Kaplan, 4, wander through an aquarium during a family outing to Six Flags amusement park Aug. 20, 2016 in Vallejo, Calif.

James Kaplan, 8, and his sibling Charley Kaplan, 4, wander through an aquarium during a family outing to Six Flags amusement park Aug. 20, 2016 in Vallejo, Calif.