|Airdate||July 23, 1999|
Body Chemistry launched in BrainPOP Health/Science July 23, 1999. Over 18 years, they made an update.
- At the end, the sign "Tim is a Koo-Koo Head" is shown.
- However in 2017, the ending was edited. After Tim says The End, it just fades to black rather than showing the "Tim is a Koo-Koo Head" sign ending probably because it's just too mean.
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