• Infielder Eric Sogard and team mascot Stomper visited Stege Elementary School in Richmond, Calif., on Friday to launch the 2013 "Science of the Game" program, a partnership between the Oakland A's, Chevron and Bay Area schools. Sogard distributed "Science of the Game" workbooks to approximately 100 fourth- and fifth-graders, worked through science problems with students and rewarded them with autographed A's hats.
• Hiro Nakajima batted second, played shortstop, and was 1 for 4 with a strikeout at Triple-A Sacramento on Thursday night. He's batting .242 with the River Cats.
• The A's are 1-6 against the AL Central entering play Friday.
Rick Eymer is a contributor to MLB.com This story was not subject to the approval of Major League Baseball or its clubs.