Its a well-known fact: Morgan Freeman talks, people listen. But hes never sounded like this before. In a clip for the Science Channel first posted by Entertainment Weekly, Americas narrator-in-chief indulges in a childhood game: inhaling helium to raise the pitch of his voice. Theres no rhyme or reason to the short video — he doesnt actually explain the effects of helium, rather focusing on peculiarities in science — but it serves as a fantastic promo for the fifth season of the Science Channels Through the Wormhole. …