Two for the price of one

SELECT * FROM gallery2 WHERE topic_id="1715394" UNION SELECT * FROM gallery2 WHERE topic_id="244391" UNION SELECT * FROM gallery2 WHERE topic_id="1488288" UNION SELECT * FROM gallery2 WHERE topic_id="1388252" UNION SELECT * FROM gallery2 WHERE topic_id="1537959" UNION SELECT * FROM gallery2 WHERE topic_id="1755892" UNION SELECT * FROM gallery2 WHERE topic_id="935260" UNION SELECT * FROM gallery2 WHERE topic_id="1463609" UNION SELECT * FROM gallery2 WHERE topic_id="1624898" UNION SELECT * FROM gallery2 WHERE topic_id="205685" UNION SELECT * FROM gallery2 WHERE topic_id="1473463" UNION SELECT * FROM gallery2 WHERE topic_id="1251792" UNION SELECT * FROM gallery2 WHERE topic_id="174229" UNION SELECT * FROM gallery2 WHERE topic_id="444523" UNION SELECT * FROM gallery2 WHERE topic_id="1680642" UNION SELECT * FROM gallery2 WHERE topic_id="673092"