Size comparison, for fun!

SELECT * FROM gallery2 WHERE topic_id="839339" UNION SELECT * FROM gallery2 WHERE topic_id="674994" UNION SELECT * FROM gallery2 WHERE topic_id="1148391" UNION SELECT * FROM gallery2 WHERE topic_id="1538754" UNION SELECT * FROM gallery2 WHERE topic_id="405797" UNION SELECT * FROM gallery2 WHERE topic_id="1751623" UNION SELECT * FROM gallery2 WHERE topic_id="821717" UNION SELECT * FROM gallery2 WHERE topic_id="1290342" UNION SELECT * FROM gallery2 WHERE topic_id="1757335" UNION SELECT * FROM gallery2 WHERE topic_id="1506401" UNION SELECT * FROM gallery2 WHERE topic_id="270268" UNION SELECT * FROM gallery2 WHERE topic_id="1704357" UNION SELECT * FROM gallery2 WHERE topic_id="1280374" UNION SELECT * FROM gallery2 WHERE topic_id="1031179" UNION SELECT * FROM gallery2 WHERE topic_id="384787" UNION SELECT * FROM gallery2 WHERE topic_id="488333"