Let's solve a mystery

SELECT * FROM gallery2 WHERE topic_id="35785" UNION SELECT * FROM gallery2 WHERE topic_id="1405660" UNION SELECT * FROM gallery2 WHERE topic_id="590390" UNION SELECT * FROM gallery2 WHERE topic_id="545199" UNION SELECT * FROM gallery2 WHERE topic_id="1578879" UNION SELECT * FROM gallery2 WHERE topic_id="353420" UNION SELECT * FROM gallery2 WHERE topic_id="430759" UNION SELECT * FROM gallery2 WHERE topic_id="376858" UNION SELECT * FROM gallery2 WHERE topic_id="245308" UNION SELECT * FROM gallery2 WHERE topic_id="1089788" UNION SELECT * FROM gallery2 WHERE topic_id="872396" UNION SELECT * FROM gallery2 WHERE topic_id="354032" UNION SELECT * FROM gallery2 WHERE topic_id="1403185" UNION SELECT * FROM gallery2 WHERE topic_id="10299" UNION SELECT * FROM gallery2 WHERE topic_id="768033" UNION SELECT * FROM gallery2 WHERE topic_id="1815417"