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Smart Potties: High-Tech Toilets Offer a Futuristic Flush. One Costs $20,000.
(www.mansionglobal.com)
This is a most excellent place for technology news and articles.
I just want one with a built in, automatic poop knife
Just stick a garbage disposal in there that turns on every flush. As long as you aren't shitting out whole nuts and bones it should work.
Way ahead of you: https://en.wikipedia.org/wiki/Maceration_%28sewage%29?wprov=sfla1