Kari Elizabeth Byron (born December 18, 1974) is an American television host, best known for her role on the MythBusters and White Rabbit Project series.
Byron was born in the Bay Area, California. She graduated from Los Gatos High School in Los Gatos, California, and studied at San Francisco State University, graduating in May 1998 with a Bachelor of Arts in film and sculpture. She spent the following year backpacking, primarily in South Asia, and was involved in a number of art projects.
Byron was a cast member on MythBusters from 2004 to 2014. Along with fellow cast members Tory Belleci and Grant Imahara she was part of what is commonly referred to as "The Build Team" or B Team. This Build Team worked with Adam Savage and Jamie Hyneman to test the plausibility of various myths throughout their tenure with the show. She and the others also hosted their own segments. She became involved in the show after persistently showing up at Hyneman's M5 Industries workshop in a desire to get hired by his company. She and the other Build Team members were given a more prominent role beginning with the show's second season. Not having had a long history in show business, Byron at first found it difficult to act naturally with this more visible position but gradually became more accustomed to it.

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