A peer-reviewed article is published in a peer-reviewed journal only after it has been subjected to multiple critiques by scholars in that field. Peer-reviewed journals follow this procedure to make sure that published articles reflect solid scholarship and advance the state of knowledge in a discipline.
In baseball, a walk-off home run is a home run that ends the game. It must be a home run that gives the home team the lead (and consequently, the win) in the bottom of the final inning of the game. Thus the home team can walk off the field immediately afterward, rather than finishing the inning. The winning runs must still be counted at home plate.
A reference to a series of batters getting on base safely and advancing runners on base, alluding to an assembly line. Beltran's popout tore apart a rally that had shaken the Hall of Fame-bound Rivera, molding a game out of what moments before had been a five-run rout.