September 1, 2015 8:30 am Obama Treks Into the Alaskan Wild With Bear Grylls On Tuesday, adventurer Bear Grylls will lead President Obama on a trek through Alaska’s wilderness. They’re hiking to a glacier and taking a boat tour to see climate change firsthand. US & World Videos 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 1:01 Biden administration plans to reclassify marijuana as a Schedule III drug 2:28 King Charles returns to public duties amid cancer diagnosis