What 2006 animated movie starred dancing penguins led by Mumble?

Happy Feet

In Greek mythology, who ferries souls across the River Styx? Which chess title is given by FIDE recognized globally as the highest? Which European explorer gave thanks in 1541, predating the Pilgrims' feast, near Palo Duro Canyon in modern-day Texas? Who was the author of 'Silent Spring,' sparking environmental activism? Which film studio was investigated and blacklisted during the Red Scare for alleged communist ties?