Sorry for the topic.... But I'm installing new ABS sewer pipe and as I
do this, I'm wondering how poop actually "flows" through various types
of sewer pipe?

At the store are sharp 4" 90 degree bends and also longer more gradual
90 degree bends. I should think the "poop" would go around a bend in a
pipe "easier" if it was a "wider" turn?

Which got me to thinking that they have those sewer cameras now. Maybe
someone made some videos of poop going through various sections of
sewer pipe? And you would be able to see "how it works"???
What works best?

Besides large pipe, proper venting, and the proper drop per foot for
the sewer pipe, perhaps some designs are better than others?

Anyway I searched google videos and could only find videos of sewer
pipe inspections and nothing being "flushed" during the video. Anyone
know where there would be a video of this?

And dumb question... Does poop "float" down the pipe in the "wash of
water" from the toilet flush? (I would think it would be "sticky",
would sink to the bottom, and would tend to get stuck?)