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Watch Online

Watch the complete June 25, 2008 broadcast of NOVA scienceNOW here. To watch any of our segments from past episodes online, go to past stories.

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Running time: 2:34

	Dark Matter Running time: 13:50 Turns out most of the universe is held together by a mysterious, invisible substance. Watch this segment
	Of Mice and Memory Running time: 12:16 Mice placed in enriched environments can recover lost memories, giving hope to those who study Alzheimer's. Watch this segment
	Profile: Hany Farid Running time: 13:13 This self-proclaimed "accidental scientist" is a digital detective inventing new ways to tell if photos have been faked. Watch this segment
	Wisdom of the Crowds Running time: 4:28 Ask enough people to estimate something, and the average of their guesses will get you surprisingly close to the right answer. Watch this segment