Watch: The phi phenomenon
In this optical illusion, stationary objects shown in rapid succession appear to move. Why? They're transcending the threshold at which they can be perceived separately.
Encyclopædia Britannica, Inc.
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Encyclopædia Britannica, Inc.Learn about the biochemistry and characteristics of the pea family (Fabaceae).
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Contunico © ZDF Studios GmbH, MainzOverview of various Pacific coral reef sharks, notably the blacktip reef shark, gray reef shark, and nurse shark.
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Encyclopædia Britannica, Inc.Overview of the dodo.
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Encyclopædia Britannica, Inc.Learn about the difference between prokaryotes and eukaryotes.
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© World Science Festival (A Britannica Publishing Partner)A neuroscientist explains what's happening in a person's brain when they're texting.
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© World Science Festival (A Britannica Publishing Partner)Brian Greene and Richard Dawkins discussing their notions of God in the context of evolution and science. This video is taken from a World Science Festival program on September 24, 2014.
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Encyclopædia Britannica, Inc.Learn what defines an organism and consider two candidates for the title of world's smallest organism—the bacteria Carsonella ruddii and Mycoplasma genitalium.
