▁the ▁return ▁cargo ▁that ' s ▁going ▁to ▁be ▁coming ▁back ▁to ▁Earth ". ▁ST S - 1 3 5 ▁delivered ▁ 9 4 0 3 ▁pounds ▁of ▁cargo ▁in ▁the ▁M PL M ▁up ▁to ▁the ▁space ▁station ▁and ▁the ▁crew ▁pack ed ▁up ▁ 5 6 6 6 ▁pounds ▁of ▁returning ▁cargo ▁inside ▁the ▁M PL M . ▁The ▁crew ▁also ▁installed ▁the ▁control ▁and ▁power ▁assemb lies ▁in ▁the ▁h atch ▁leading ▁into ▁the ▁M PL M . ▁On ▁the ▁next ▁day , ▁the ▁controllers ▁were ▁used ▁to ▁drive ▁the ▁bol ts ▁to ▁release ▁the ▁M PL M ▁from ▁Node ▁ 2 . ▁ ▁At ▁ 1 0 : 1 0 ▁UTC , ▁pilot ▁Doug ▁Hur ley ▁and ▁Mission ▁Special ist ▁R ex ▁Wal heim ▁answered ▁vide ot aped ▁questions ▁from ▁students ▁at ▁NASA ▁Explorer ▁School s ▁across ▁the ▁United ▁States . ▁It ▁was ▁the ▁last ▁interactive ▁educational ▁event ▁conducted ▁by ▁a ▁Space ▁Sh utt le ▁crew . ▁ ▁After ▁their ▁m idd ay ▁me al , ▁Mission ▁Special ist ▁Sand ra ▁Magn us ▁and ▁Commander ▁Chris ▁Fer g us on ▁worked ▁a ▁little ▁over ▁an ▁hour ▁continu ing ▁to ▁move ▁experiments ▁and ▁equipment ▁to ▁and ▁from ▁Atl ant iss ▁mid deck . ▁At ▁the ▁end ▁ 8 4 % ▁of ▁mid deck ▁trans fers ▁were ▁completed . ▁The ▁crew ▁transferred ▁a ▁new ▁science ▁re fr iger ator ▁( GL AC I ER ) ▁from ▁the ▁Sh utt le ' s ▁mid deck ▁to ▁the ▁Space ▁Station . ▁Another ▁couple