[AFPhys]

I did not rely on my sibling's digestive tract for my data. As a young budding scientist, I did my own research with pennies. My FART score was 2½ days.

[Rockingham]

That sounds about right. My brother had the knack for that kind of experimentation, swallowing down chewing gum, cardboard, marbles, and the heads of plastic toy army men before discovering pennies to be the superior indicator material. The digestive tract worked a magical transformation of dull pennies to bright and shiny.