sentence: Loganathan taught an Advanced Hydrology class in Norris Hall's Room 206. On April 16, 2007, Cho entered Norris 206 and opened fire.
modified: fix grammar: Loganathans taught an Advanceds Hydrologys classes in Norriss Halls's Rooms 206. On Aprils 16, 2007, Choes entered Norriss 206 and opened fires.