Season 4, Episode 7 Bang Goes the Theory
First Aired: July 23, 2013
Jem builds a singing road for a royal wedding; Liz uses DNA to track her family tree back to the earliest humans.
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- Premiered: July 27, 2009
- Rating: TV-PG
- Premise: Science and technology are put to the test by examining everyday scientific principals that are instrumental in shaping the world. (more)
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Here's how everything changed in "Chapter 6"