Episodes (Page 114)
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Viruses invade cells, causing illness.
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Skywriting originated for military communication in the 1920s.
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Karate, meaning 'open hand', originated in Okinawa.
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Panic attacks cause intense fear without apparent reason.
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Rogue waves are massive, unexpected ocean waves.
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Animal domestication was a pivotal event in human history.
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Police interrogations often rely on flawed scientific methods.
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Currency has taken many forms throughout history.
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Socialism remains a part of the U.S. national character.
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Stem cells have the potential to heal various medical conditions.
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Nielsen determines TV show success and cancellation.
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Pinball was illegal in some cities until the 1970s.
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Hindenburg disaster curtailed airship development.
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Headstones evolved from simple wood to elaborate Victorian designs.
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The Berlin Wall physically divided East and West Germany.
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Elevators are more complex than they appear.
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Ebola, discovered in the 1970s, resurged in 2014.
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The NSA's secret world is explored.
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Numbers stations still send coded messages.
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Play-Doh originated as a wall cleaner.