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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

Dark Matter

Running time: 13:50
Turns out most of the universe is held together by a mysterious, invisible substance.
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Of Mice and Memory

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.
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Profile: Hany Farid

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.
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Wisdom of the Crowds

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.
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