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Worth noting

• 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
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