|Airdate||July 23, 1999|
March 31, 2017 (Update)
Body Chemistry launched in BrainPOP Health/Science July 23, 1999. Over 18 years, they made an update.
At the end, after Tim says "The End!", it just fades to black instead of showing the "Tim is a Koo Koo Head" sign.
- The ending was edited. after Tim says "The End!", it just fades to black.
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