August 27, 2017 1:34 pm ‘Unprecedented Flooding' Hammers Houston The National Weather Service says the floods hitting Houston, Texas, are unprecedented. See some of the flooding and hear from Houston Mayor Sylvester Turner on why he did not order mandatory evacuations. US & World Videos 1:35 Understanding the Biden administration's plans to reclassify marijuana 1:45 NYPD enters Columbia University in riot gear to clear protest 4:28 ‘Apples Never Fall' and ‘Jurassic Park' star Sam Neill reveals his real name 3:21 Katy Perry's surprising regret about cheeseburger Met Gala look 2:28 King Charles returns to public duties amid cancer diagnosis