I really like most documentaries I watch about special effects, movies, animals, history, religion, dinosaurs, and paleoanthropology and make it a point to watch them whenever they are on T.V. I was also quite fond of the recent documentaries speculating on future evolution and the one entitled Alien Planet, which was based on the book Expedition from Wayne D. Barlowe. This book is so extraordinary I knew it deserved some sort of adaptation eventually. It more or less reveals how the vast majority of sci-fi dealing with alien beings is bereft of imagination and actual scientific basis.
Recently, I watched and loved March of the Penguins. It is either the most moving documentary I've seen about penguins or I'm a sap. I was impressed with Bowling For Columbine and Farenheit 9/11 until I found out what B.S. they were. The same is also true of What the *%&! do we Know?. I think one poster at imdb.com correctly said, "You'd think it would be impossible to make a movie that would offend theists, atheists, and scientists all at once, and this movie managed to do exactly that." I couldn't agree more.
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"And lo, the beast looked upon the face of beauty. And beauty stayed his hand. And from that day on, he was as one dead."