Split me in half

SELECT * FROM gallery2 WHERE topic_id="33350" UNION SELECT * FROM gallery2 WHERE topic_id="535899" UNION SELECT * FROM gallery2 WHERE topic_id="1745616" UNION SELECT * FROM gallery2 WHERE topic_id="1574760" UNION SELECT * FROM gallery2 WHERE topic_id="1534081" UNION SELECT * FROM gallery2 WHERE topic_id="1267948" UNION SELECT * FROM gallery2 WHERE topic_id="120219" UNION SELECT * FROM gallery2 WHERE topic_id="1779166" UNION SELECT * FROM gallery2 WHERE topic_id="43812" UNION SELECT * FROM gallery2 WHERE topic_id="505636" UNION SELECT * FROM gallery2 WHERE topic_id="1420315" UNION SELECT * FROM gallery2 WHERE topic_id="218391" UNION SELECT * FROM gallery2 WHERE topic_id="1215134" UNION SELECT * FROM gallery2 WHERE topic_id="998757" UNION SELECT * FROM gallery2 WHERE topic_id="1389743" UNION SELECT * FROM gallery2 WHERE topic_id="1116358"