Oh man, the business opportunity for someone to find a gene to genetically modify or invent a more efficient digestive system that doesn't produce waste.
How productive would that be to never have to spend time every day on the shitter. Imagine the global revolution that would bring. No more toilets, no need for sewerage systems. No more need for toilet paper.
Imagine the joy of parents in not having to worry about nappies or toilet training.
Entire environmentally unfriendly industries could be shut down completely.
Any biological scientists out there who could lend an opinion? If we know this is possible in theory, we can start brainstorming a way to make it happen. Technology is probably beyond us now, but technology can move very very fast when it needs to.